solve -3x-2y=2, 9x-5y=-28 using the elimination method

Step-by-step explanation:

rhehdjvjdjdisjfjehsugjdjsjcjfi

Answer:

18,060

Step-by-step explanation:

0.86 kilometers is the same as 860 meters. If he swam 860 meters a day for twenty-one days, (860 times 21) he'd end up with 18,060 meters in total.

(That's about 722 1/2 lengths of a pool, but you didn't need to know that :P )

Answer:  136 square feet

=======================================================

Explanation:

The front face is a triangle with base 6 and height 4.

The area is 0.5*base*height = 0.5*6*4 = 12 square feet

The back face is also 12 square feet since the front and back faces are identical triangles.

So far we have 12+12 = 24 square feet of surface area.

--------------------

The bottom face, that runs along the floor or ground, is a rectangle that is 6 ft by 7 ft. So we have 6*7 = 42 square feet of surface area here. This adds onto the 24 we found earlier to get 24+42 = 66 square feet so far.

To find the left and right upper faces, we'll need to find the length of the hypotenuse first. The 6 ft cuts in half to 3 ft. The right triangle on the left has side lengths of 4 ft and 3 ft as the two legs. Use the pythagorean theorem to find the hypotenuse is 5 ft. We have a 3-4-5 right triangle.

This means the upper left face is 5 ft by 7 ft leading to an area of 5*7 = 35 square feet. The same can be said about the upper right face.

So we add on 35+35 = 70 more square feet to the 66 we found earlier to get a grand total of 70+66 = 136 square feet of surface area.

Answer:

$5.00

Step-by-step explanation:

All we have to do is multiply 25 x 1/5 or 20%

25 x 1/5 = $5.00

to check, $5 x 5 = 25

Answer: 24x + 125 > 550

Step-by-step explanation:

Answer:

1 1/2 cups of flour :))

Step-by-step explanation:

Answer:

2 5/8 cups ur welcome

you convert  1 3/4 to improper fraction so 7/4. then divide 7/4 by 2 which is 0.875. 0.875+7/4= 2.625 which is 2 2/3.

Answer:

100

Step-by-step explanation:

Answer:95.12

Step-by-step explanation:trust me

Answer:

3x + 3y

Step-by-step explanation:

3x (x being the number of apples)

3y (y being the number of bananas)

Answer:

answer is -8.4 if you add 3.6 and two it's 5.6 times 1.5 it will be -8.4

Answer:

2.4

Step-by-step explanation:

It should be 2.4 based on what I see here.  Distribute -1.5 into -3.6 + 2 to get 5.4 - 3.  You should get 2.4 as your answer in which it is the second option, the picture needs to be in standing position next time because it is upside down though but it can be flipped either way.

Answer:

In A and D the arrows are perpendicular, in B they are parallel and in C they are neither parallel nor perpendicular.

Step-by-step explanation:

Answer:

1) When r = 2, M = 20.

2) When M  = 540, r = 6.

Step-by-step explanation:

M is a directly proportional to r cubed

This means that the equation for M has the following format:

[tex]M = ar^3[/tex]

In which a is a multiplier.

When r=4 M=160.

We use this to find a. So

[tex]M = ar^3[/tex]

[tex]160 = a(4^3)[/tex]

[tex]64a = 160[/tex]

[tex]a = \frac{160}{64}[/tex]

[tex]a = 2.5[/tex]

So

[tex]M = 2.5r^3[/tex]

1) work out the value of M when r=2

[tex]M = 2.5*2^3 = 2.5*8 = 20[/tex]

When r = 2, M = 20.

2) work out the value of r when M=540

[tex]M = 2.5r^3[/tex]

[tex]540 = 2.5r^3[/tex]

[tex]r^3 = \frac{540}{2.5}[/tex]

[tex]r^3 = 216[/tex]

[tex]r = \sqrt[3]{216}[/tex]

[tex]r = 6[/tex]

When M  = 540, r = 6.

Answer:

(-x-7)(x+4)

Step-by-step explanation:

Answer:

3.0

Step-by-step explanation:

Answer:28

Step-by-step explanation:

25% × x = 7

Multiplying both sides by 100 and dividing both sides by 25,

we have x=7 x 100/25

7×100÷25

x=28

Answer:

AC ; AB ; BC

Step-by-step explanation:

Recall that largest angles will oppose largest sides in a triangle, therefore, the angles in order of greatest to smallest are:

<B (84); <C (60);  <A (36)

Their opposite sides will keep the same order from largest to smallest:

AC ; AB ; BC

The side lengths, in order from greatest to least, are

AC

AB

BC

Step-by-step explanation:

circumference = 2πr

π = 3.14

r = 13.4

2 × 3.14 × 13.4 = ¯\_(ツ)_/¯

Answer:

0.714286

Step-by-step explanation:

yes

Answer: let's try the Second one ( sorry if i get it wrong)

Step-by-step explanation:

Each number in the sequence is called a term. In the sequence 1, 3, 5, 7, 9, …, 1 is the first term, 3 is the second term, 5 is the third term, and so on. The notation a 1, a 2, a 3,… a n is used to denote the different terms in a sequence. The expression a n is referred to as the general or nth term of the sequence.

Answer:

it is the first one

Step-by-step explanation:

Answer:

the ratio is 12:8 boys to girls

Step-by-step explanation:

if the amount of boys is 12 then multiply the 3 by 4 and using distribution multiply the 2 by 4 as well to get 8 girls

Answer:

44%

Step-by-step explanation:

So you have 2 bottles. One bottle is 8ml and is 80% acid. the other is 12 ml and is 20% acid.

This means there's 6.4 ml of acid in bottle 1(8*0.8) and 2.4 ml of acid in the other one(12*0.2).

The total amount of liquid is 8+12 = 20

The total amount of acid is 6.4+2.4 = 8.8

Percentage of acid in the new solution is 8.8/20 = 0.44 = 44%

Answer: B

Step-by-step explanation:

Answer: ok....

Step-by-step explanation:

Answer: no

Step-by-step explanation: Khan says no because

Let's plug (−2,−6) into the inequality.

y< 7x +8

(-6) < 7 (-2) +8

-6≮−6

​

Answer: 64 ft for each wall in his bedroom..

Step-by-step explanation: 256 divide 4 = 64.

Answer:

Y=375x

Step-by-step explanation:

thats the answer

Answer:

.014

Just trust me, you know I have your back

Answer:

Option B: 6x-4=50; x=9 is the correct answer.

Step-by-step explanation:

Given that:

x is the variable used for number.

6 times a number means 6x and difference means subtraction.

Thus according to given statement;

6x - 4 = 50

Adding 4 on both sides

6x - 4 + 4 = 50+4

6x = 54

Dividing both sides by 6

[tex]\frac{6x}{6}=\frac{54}{6}\\x=9[/tex]

Hence,

Option B: 6x-4=50; x=9 is the correct answer.

Step-by-step explanation:

If the exchange rate is 1 Euro to 0.80 pounds

So,

30 Euro=0.8×30=24.0=24 pounds.

so,

24 pounds would you spend to purchase something that costs 30 Euros