WORTH 15 POINTS!! - Eileen's Energy Bars has determined that an energy bar measuring 3.25 inches long has a z-score of +1 and an energy bar measuring 3.50 inches long has a z-score of +2.
What is the standard deviation of the length of energy bars produced at Eileen's Energy Bars?
3.5
3.25
0.75
0.25
Answer:
0.25
Step-by-step explanaition:
The z-score represents how many deviations a value is from the mean. When the bar measures 3.25, the z-score is +1. When the bar measures 3.50, the z-score is +2. You'll notice that whenever the bar size increases by 0.25, the z-score goes up +1. So, the standard deviation from the mean must be 0.25.
Answer:
0.25
Step-by-step explanation:
i took the test
A school district has decided that students in grades 7 through 12 should receive 400 minutes of physical education every 10 school days. A gym teacher at one of the schools believes that his students are not meeting this criterion. She randomly selects 50 students and it is found that her students have a mean of 385 minutes and a standard deviation of 55 minutes. Is this evidence to support her claim?
Answer:
Yes
Step-by-step explanation:
Based on the information provided we can say that Yes, this is enough evidence to support her claim. Since the 50 students were randomly selected and the physical education criteria applies to all of the students in that grade range then these 50 students perfectly represent the total population. That being the case, the results gathered to show that with a standard deviation of 55 minutes some students are surpassing the requirement by very little but others are falling very far from that requirement. When it is a requirement for all of the students in that grade range. Therefore, it is enough to support her claim.
Solve the system by elimination. . 4x-9y=-21 , -4x-3y=9
Is 5 a solution to the equation x + 3 = 8
______________________________
1.) Subtract 3 from both sides:[tex]3-3=[/tex] Cancels Out[tex]8-3=5[/tex]
- When solving problems like these (One-Step Equations,) to get x alone you must do the opposite of what you see.
- In this situation we have a positive 3. So to get rid of both numbers you do the opposite: Opposite of +3 is -3. So you subtract 3 from each number.
______________________________
Algebra 1 plz help me
Answer:
Step-by-step explanation:
solution is (4,3)
OR
x=4
y=3
this point lies in both the tables.
we have to find a pair which lies on both.
what is. the value of x in the equation 2.5(6x-4)=10+4(1.5+0.5x)?
Answer:
x=2
Step-by-step explanation:
We first distribute this. So we have 15x-10 = 10 + 6 +2x.
Then we move the variable to one side and have 13x= 10+10+6
Simplify to get 13x = 26.
x=2
–2 • 4? what is the anserw do you now
Answer:
Step-by-step explanation:
-8 because a negative times a positive is a negative so w times 4 equals I and since it’s a negative sign it’s -8
on Monday the high was 60 degrees Fahrenheit on Tuesday the high was 18% more how much did the high increase from Monday to Tuesday
Answer:
10.8 deg
Step-by-step explanation:
18% of 60 = 0.18 * 60 = 10.8
The high increased 10.8 deg
Alonzo is making apple tarts for a party. He needs 3 apples for every 8
tarts. How many apples does he need if he wants to make 40 tarts?
(A) 18 apples
(B) 15 apples
(C) 12 apples
(D) 10 apples
Answer:
15
Step-by-step explanation:
so the amount for apples are 3 for 8.so if you multiply 8 x 5 it is 40.3 is for 8 and there is the answer
HELPPP!!!!!!
Tiana and Vince are practicing their typing skills in computer science class. They both typed the same number of words, but Tiana took less time. They are participating in a typing competition next week. In the competition, they will have the same amount of time to type. Who will likely type more words during the competition?
Answer:
tiana
Step-by-step explanation:
because she took less time in the practise
Answer:
Tiana
Step-by-step explanation:
It is Tiana because she took less time while practicing.
The sum of two number is 21 the second number is six times the first one workout the two numbers
Answer: 3 and 18
Step-by-step explanation:
x + 6x = 21
7x = 21 Divide both sides by 7
x = 3 That's the first number. Multiply by 6 for the second number:
6 × 3 = 18
Cheddar cheese cost 4.25 per pound. Which equation best represents y, the cost of x pound of cheddar cheese
Answer:
y = 4.25x
Step-by-step explanation:
Cheddar cheese cost 4.25 per pound . This means the cost of cheddar cheese is 4.25 for every pound in weight. Assuming we put a currency to the value we can say 1 pound of cheddar cheese is equals to 4.25 dollars($4.25). Mathematically, it can be represented as
4.25 is the cost for 1 pound of Cheddar cheese
Let the cost of the equation be y as required from the question.
y = cost of the cheddar cheese
x is the weight value in pounds of the Cheddar cheese.
The equation can be best represented as
y = 4.25x
In the equation above if the amount in pounds is 3 pound . the value will be inputted for x and the cost will be gotten which is y.
hope this helps!:)
Erica purchased adult and youth tickets for a movie. She bought x adult tickets for $7 each and y youth tickets for $5. Write an expression that can be used to show the total cost, C, of all tickets.
PLZ HELP IM FALING :o
i will give brainlyest
Answer:
C = 7x + 5y
Step-by-step explanation:
Algebraic Expressions
Erica purchased tickets for a movie. It's given each adult ticket cost $7 and each youth ticket cost $5.
If each adult ticket cost $7 and she bought x tickets, then she spent 7x dollars on adult tickets.
Similarly, if each youth ticket cost $5 and she bought y tickets, then she spent 5y dollars on youth tickets.
The total cost C is the sum of the individual costs, thus:
C = 7x + 5y
How many solutions does the system have?
y = 5 + 6x
y = 6x + 5
Choose 1 answer:
A Exactly one solution
B No solutions
C Infinitely many solutions
1 - 3x = 3x + 1 solve for x
Answer: x = 0
Step-by-step explanation:
1 - 3x = 3x + 1
then add 3x on both sides
1 = 6x + 1
then subtract 1 on both sides
0 = 6x
then divide by 6 on both sides
0 = x
so x = 0
Answer:
x would be unknown bc there wouldnt be an answer since
1-3x=3x+1
if we take away 1 forom both sides were left with -3x=3x and it would be 6x if we combined them which can be possible bc it would be nothing = 6x if that makes sense
Step-by-step explanation:
write 2.5896 * 10^-4 in standard form
Answer: use a standard form calculator
Step-by-step explanation: it helps alot :)
If P=(-3,5) and Q=(1,9), find the midpoint of the segment PQ
Answer:
[tex](-1,7)[/tex]
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightAlgebra I
Midpoint Formula: [tex](\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})[/tex]Step-by-step explanation:
Step 1: Define
Point P(-3, 5)
Point Q(1, 9)
Step 2: Find Midpoint
Simply plug in your coordinates into the midpoint formula to find midpoint
Substitute {MF]: [tex](\frac{-3+1}{2},\frac{5+9}{2})[/tex]Add: [tex](\frac{-2}{2},\frac{14}{2})[/tex]Divide: [tex](-1,7)[/tex]help pls lol ✋
i literally do not get this at all and i’m typing this cause apparently i need 20 words which is dumb but yeah okay bye
A child has 60 total coins. There are ten times as many nickels as there are quarters (q) and twelve more dimes than quarters. Write an equation to represent this situation
Answer:
10q+q+(12+q)=60
NEED HELP!! what makes this equation true enter the answer in the box ÷ 8 = 4
Answer:
32 divided by 8 =4 Just multiply 4 and 8 to get your answer.
Step-by-step explanation:
Hey! hoped I helped Im Eve btw Have an amazing day and consider marking this as brainliest if you do thank you in advance!
What is the area of a rectangle with a width of x2 + x + 1 and a length of
3x2 - 2x - 1?
Answer:
[tex]x^{4}[/tex] + 3x³ - 3x - 1
Step-by-step explanation:
The area (A) of a rectangle is calculated as
A = lw ( l is the length and w the width ) , thus
A = (3x² - 2x - 1)(x² + x + 1)
Each term in the second factor is multiplied by each term in the first factor, then
A = 3x²(x² + x + 1) - 2x(x² + x + 1) - 1(x² + x + 1) ← distribute parenthesis
= 3[tex]x^{4}[/tex] + 3x³ + 3x² - 2[tex]x^{4}[/tex] - 2x² - 2x - x² - x - 1 ← collect like terms
= [tex]x^{4}[/tex] + 3x³ - 3x - 1
help plzzzzz what is it????
Answer:
Pretty sure its C becuase there is no “people” on the graph.
Answer:x is 8 y is 4
Step-by-step explanation:
GO ACROSS!!! Plz help
a car rental company charges an initial fee plus a fee per kilometer driven. if a car drives 105 kilometers and pays 183 dollars what is the company's initial fee
Answer:
a
mark
me
brainlist
omg
Step-by-step explanation:
If rong let
p
l
e
a
s
.
me know
the answer is 100 dolers$
I've been stuck on this for like 20 minutes ;-;
Answer:
3+2
Step-by-step explanation:
Answer:
3+2
Step-by-step explanation:
-3(4x-2)-2 is equvalnt to what eqatuion
Answer:
−12x + 4
Step-by-step explanation:
Distribute:
= ( − 3 ) ( 4x ) + ( − 3 ) ( − 2 ) + − 2
= − 12x + 6 + − 2
Combine Like Terms:
= − 12x + 6 + − 2
= ( − 12x ) + ( 6 + − 2 )
= − 12x+4
I need help ASAP pls help me!!:/
Answer:
if i am right it yes yes no
Step-by-step explanation:
The name of every student taking Algebra was listed alphabetically and numbered. The teacher uses
an arithmetic sequence to call on students. The numbers of the first 3 students are listed below.
What will be the number of the 25th student chosen?
9,6, 3...
Answer:
The number will be -63
Step-by-step explanation:
Here, we want to give the number of the chosen 25th student
We can see that the numbering follows an arithmetic sequence where a = 9 and d which is the common difference is (6-9) = -3
Mathematically, we can calculate the nth term using the equation below;
Tn = a + (n-1)d
in this case, n = 25, a = 9 and d = -3
So we have
Tn = 9 + (25-1)-3
Tn = 9 -3(24)
Tn = 9-72
Tn = -63
=
105 min
game
?hr.
game
Help please
Answer:
105 minutes= 1 hour and 45 minutes
Answer:
1 hour and 45 minutes
or
1.75 hours
a long-distance telephone call costs $1.65 for the first 3 minutes and $0.42 for each additional minute. how much will a 23-minute call cost
Answer:
About $43.69.
Step-by-step explanation:
1.65+0.42t=20 you minus the 3 minutes from the 23 minutes because those are paid for by the 1.65. Then for every extra minute, you pay 42 cents.
1.65+0.42t=20
Subtract the 1.65
0.42t=18.35
t≈43.69