Mathematics College

Seven more than twice a number is equal to 21​

Answers

Answer 1

Answer:

x = a number

7 + 2x = 21

Subtract 7 from both sides

2x = 14

Divide both sides by 2

x = 7

7 is the only number that makes this sentence true.

Step-by-step explanation:

Answer 2

Answer:

7

Step-by-step explanation:

Do the steps in reverse

Subtract 7 from 21

14

Then divide by 2

7

Hope this helps :)

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Related Questions

Katie completes 2/3 of her craft project in 3/4 of an hour at this rate what fraction of the craft project does Katie complete in one hour give your answer in fraction form

Answers

Answer:

2/3 in 3/4 of an hour. that would mean u an extra 1/4 of an hour would give Katie the time to finish up the project

Step-by-step explanation:

Katie, take no breaks when u can get this done in an hour. don't be lazy

If I have a black lab, then I have a dog. What is this statement called: if I do not have a dog then I do not have a black lab. HELP PLEASE

A) inverse
B) converse
C) conditional
D) contrapositive

Answers

Answer:

contrapositive

Step-by-step explanation:

What is the image point of (0, 2) after a translation lett 5 units and down 1 unit?

Answers

Answer: (-3, 1)

explanation: I drew a graph and translated it!


Four students took an exam. The
fraction of the total possible points that each
received is given. Which student had the highest
score? If students receive a whole number of
points on every exam item, can the exam be
worth a total of 80 points? Explain.

Answers

Answer:

what are the fractions

Please help 15 points available! What is the equation of the line that is perpendicular to y - 3 x = 2 and that passes through (6,1)?
y = 1/3x - 1
y = 1/3x + 3
y = -1/3x + 3
y = -1/3x - 1

Answers

Answer:

C) y = -1/3x + 3

Step-by-step explanation:

y - 3x = 2

  + 3x   + 3x

y = 3x + 2

find the reciprocal of the slope (3) which is -1/3 so -1/3 will be the slope for the perpendicular line

y = (-1/3)x + b

now find the y-intercept (b)

(6,1) x = 6   y = 1

y = (-1/3)x + b

1 = (-1/3)6 + b

1 = -2 + b

+2  +2

3 = b

y = (-1/3)x + 3

Answe

Is c
Hope this help

if x=3 and x-y= -3

a.4
b.6
c.5
d.10

Answers

Are you sure thats the full m question?

A new sidewalk will be 4 feet​ wide, 240 feet​ long, and filled to a depth of 9 inches ​(0.75 ​foot) with concrete. How many cubic yards of concrete are​ needed?

Answers

Answer: The number of cubic yards of concrete that are needed is 720.

Step-by-step explanation: The same formula for this type of shape stays the same: l*w*(h or d).

240 * 4 = 960

960 * 0.75 = 720

The amount of cubic yard of concrete needed is about 720 cubic foot

How to calculate the volume of box?

The formula for calculating the volume of the concrete is expressed as:

V = lwh

l is the length =240feet

w is the width = 4 feet

h is the depth = 0.75foot'

Determine the volume

V = 240 * 4 * 0.75
V = 720 cubic feet

Hence the amount of cubic yard of concrete needed is about 720 cubic foot

Learn more volume here:  https://brainly.com/question/9554871

#SPJ2

Please I need some answers

Answers

i believe the answers would be:

a)2^6
b)5^7
c)7^6

hope this helps :)))

HEEEEELP PLZ WILL GIVE 30 POINTS!!!!!!!!!!

Answers

Answer=

Well first we got to convert yards and feet into inches.

21 feet=252 inches

11 yards=396 inches

Alright so now that we have the inches needed we must find the cost for both Emily and Andy’s needed wire.

Emily:

We know how much it would cost for 200 inches, which is 8$.

15 inches adds a .60$ increase, which means that 5 inches is equivalent to .20$. By adding that to .60$ we get .80$ or the amount it would cost for 20 inches. We now know how much it would cost for 40 inches, 1.60$.

8+1.60=9.60 or how much it costs for 240 inches.

If it costs .80$ for 20 inches that means it costs .40$ for 10 inches.

9.60+.40=10

To find how much it costs for 2 inches we divide .40 by 5 which is .08.

10+.08=10.08$

Emily will spend 10.08$ for her needed wire.


Andy:

We know how much it would cost for 300 inches, which is 12$.

We also know how much it costs for 20 inches, which is .80$. So we multiply that by 4 to get how much it would cost for 80 inches.

.80*4=3.20

We then add that to the cost of 300 inches.

12+3.20=15.20

We know how much it would cost for 10 inches, which is .40$.

So we add that to the amount it would cost for 380 inches.

15.20+.40=15.60

Finally we know how much it costs for 2 inches, which is .08$. So we multiply that by 3 to find how much it costs for 6 inches.

.08*3=.24

We then add that to how much it would cost for 390 inches.

15.60+.24=15.84$

Andy will spend 15.84$ for his needed wire.

Answer:

Emily pays 10.40 and Andy pays 8 dollars

Step-by-step explanation:

So let's start with Emily, she need 21 feet of wire, so we convert this to inches so; [tex]1foot=12inches\\ 21feet=(12inches)*21=252inches[/tex]  but it's not listed on the tableSo we try to find the closest approximation to 252 inches which we get by adding 100 inches and 160 inches to get 260 inchesSo Emily will pay the cost of those to lengths so 100 inches cost 4.00 dollars and 160 inches costs 6.40 dollarsso she pays 4.00+6.40=10.40 dollarsNow for Andy we do much the same and find the inches in 11 yards[tex]1 yard=36inches\\ 11yards=(36inches)*11=396inches[/tex] this is also not listedSo we get the closest approximation, which is 4 of the 100 inch wires, so we get 400 inches costing 4*4.00=8 dollars


Look at these expressions:
3w + 9x - 15y + 7w + 2x + 9y
9x - 8w
6w + 5y + 7x + 4x - 11y + 4w
5x + 9y
3x - 2y + 14w - 4y - 4w + 8x
2y +5w
4w + 5x – y + 6w - 16r - 5y
perimeter =
[4] How many of them are equal?
Do not factorise the answer. Can someone please help me

Answers

Answer: the first third fourth and last one

Step-by-step explanation:

I NEED HELP WITH THIS PLSS!!!

Answers

Hope this helps you out.

covent 9/5 to a mixted number

Answers

Answer:

easy just divide 9 by 5

Step-by-step explanation:

To convert to a mixed number, divide nine by 5 and take the remainder and put it over the denominator.


Evaluate this expression.
112.212 - (- 3.25)

Answers

Answer:

115.462

Step-by-step explanation:

Answer: 115.462

Step-by-step explanation:

To start, the first thing we can observe is two negative signs, which we know turns into a positive sign.

Therefore, we now have:

112.212 + 3.25

115.462

Hope this helps!

Diego says that that the product of 0.51 × 2.427 will have five decimal places. Is Diego correct? Explain.

Answers

Answer: That is true

Step-by-step explanation: You add the decimal places of both numbers that u are multiplying

Answer:

Yes DIEGO is correct

Step-by-step explanation:

My man DIEGO

Seti graphed the point Three-halves and labeled that location P. Which number line shows this point? A number line going from 0 to 2 in increments of 1. There are 2 equals spaces between each number. Point P is half-way between 1 and 2. A number line going from 0 to 2 in increments of 1. There are 3 equal spaces between each number. Point P is on the mark to the left of 1. A number line going from 0 to 2 in increments of 1. There are 2 equals spaces between each number. Point P is half-way between 0 and 1. A number line going from 0 to 2 in increments of 1. There are 3 equal spaces between each number. Point P is on the mark to the right of 1.

Answers

Answer:

its D

Step-by-step explanation:

Answer:Your Answer Is (D)

Step-by-step explanation: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA HAPPY HALLOWEEN!!!

What is 56/15 as a decimal rounded to the nearest tenth

Answers

Answer:

3.73

Step-by-step explanation:

56/15

3 11/15

3.73

56/15 = 3.7333333...

3.733333... —————> 3.7

look for a pattern in the first three equations

Answers

Answer:

Is there a graph orrrrr?

Step-by-step explanation:

Show me an example of standard form​

Answers

3x + 2y = 8

JUST CALL BECKY with da GOOD HAIR!!!!! :)

Standard form is a way of writing numbers a little differently for instance...

5,000 can be written as → [tex]5*10^3[/tex]  ( In standard form. )

The ratio of boys to girls in a class is 4: 5
a) What fraction of the class are boys?
b) What fraction of the claşs are girls?

Answers

Answer:

The fraction of a boy is 4/9

The fraction of a girl is 5/9

Hope this helps!!!!!

Adding number of boys(4 boys) and girls(5 girls) together will give the total number of pupils IN ALL therefore : 4+5=9
There are 9 pupils in all

So: Fraction of BOYS=
Num of BOYS/Total Num of pupils=
4/9. —— is the answer to (a)

AND

Fraction of GIRLS=
Num of GIRLS/Total Num of pupils=
5/9 ——is the answer to (b)

Hope it’s helpful :)) !




It is known that a laptop company's average production is given by P(t) = (150t) / (3t+20), where

t is the time (in days). How many days will it take the company to produce 30 laptops?

Answers

Answer:

10 days

Step-by-step explanation:

Step one:

given that the expression for the company's average production is

[tex]P(t) = (150t) / (3t+20)[/tex]

Required:

t, when P=30

Step two:

substituting we have

30=150t/3t+20

cross multiply we have

30(3t+20)=150t

90t+600=150t

collect like terms

600=150t-90t

600=60t

divide through by 60

t=600/60

t=10 days

it will take the company 10 days

What is the slope of a line that passes through (-4 -13) and (19, 11)
a. 23/24
b. 24/23
c. -23/24
d. -24/23

Answers

The answer you're looking for is 24/23.

I just took the test myself and this is correct.

You reflect triangle PQR, with vertices P(-2, -4), Q(-3, -1), and R(-4, -4), across the y-axis to get triangle P′Q′R′. What are the coordinates of triangle P′Q′R′?

Answers

Answer:

Step-by-step explanation:

If you reflect about the y-axis, only the x-coordinates reverse sign while the y-coordinates stay the same....

P'(2,-4), Q'(3,-1), R'(4,-4)

What’s the answer to this multi step equation? -3(12x+9)=9

Answers

Answer: x=-1

Step-by-step explanation:

A taxi cab charges a flat fee of $1.75 plus $0.30 for each half-mile or fraction of a half-mile.

a) Fill in the chart.

b)write and equation for the function.

Answers

Answer:

a) there is no chart but we can elaborate one:

taxi fee            half-miles driven

$1.75                      0

$2.05                     1

$2.35                     2

$2.65                     3

$2.95                     4

$3.25                     5

$3.55                     6

b) y = 0.3x + 1.75

where:

y = taxi fee

x = half miles driven

What is the length of z? (Round to the nearest tenth)

Answers

Answer:

z = 10.8

Step-by-step explanation:

[tex]9^{2} + 6^{2} = c^{2}[/tex]

81 + 36 = [tex]c^{2}[/tex]

117 = [tex]c^{2}[/tex]

c = [tex]\sqrt{117}[/tex]

c = 10.8

c = z

Find the zero of the function: f(x) = -5x + 5

Answers

Answer:

Step-by-step explanation:

Answer: 1

Step-by-step explanation: Do math

2.6x0.47pls help
pls pls​

Answers

Answer:

1.222

Step-by-step explanation:

May you please help me on this question ill give out braily

Answers

The answer is b because d represents how many days he practices

Answer:

D is your answer :D can you answer my question pleasseeeee it would be easy for you

If you can answer this it would help me out so much!
A certain quadratic function has the factors (x + 3) and (2x - 1). What are the solutions of the function?
A- (0,3) and (0, -1)
B- (-1,0) and (3,0)
C- (6,0) and (-3,0)
D- (0,1/2) and (0, -3)

Answers

x + 3 = 0
2x - 1 = 0
It would be D.

Answer:

Thx for my points back that you stole

Step-by-step explanation:

X/4-14=9
what is x?

Answers

Step-by-step explanation:

x/4=9+14

x/4=23

x=92

iget 92

The person on top is correct it is 92
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