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3 years ago

9

Simplify the expression 2(7*-3)

1 answer:

Elenna [48]3 years ago

7 0

Answer: 11 + x

HOPE THIS HELPS

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Use Words,Pictures or Numbers, make a Math Arguement.

Pavel [41]

13, 6+7=13 thats my answer :D

8 0

3 years ago

Work out the surface area of this cylinder.<br> Radius-7 cm<br> Height-12 cm

RideAnS [48]

Answer:

226pi

Step-by-step explanation:

2 * pi * 7 *(7+12)

4 0

2 years ago

Read 2 more answers

A chemical company makes two brands of antifreeze. The first brand is 20% pure antifreeze, and the second brand is 70% pure anti

andre [41]

Answer:

First brand of antifreeze: 21 gallons

Second brand of antifreeze: 9 gallons

Step-by-step explanation:

Let's call A the amount of first brand of antifreeze. 20% pure antifreeze

Let's call B the amount of second brand of antifreeze. 70% pure antifreeze

The resulting mixture should have 35% pure antifreeze, and 30 gallons.

Then we know that the total amount of mixture will be:

$A + B = 30$

Then the total amount of pure antifreeze in the mixture will be:

$0.2A + 0.7B = 0.35 * 30$

$0.2A + 0.7B = 10.5$

Then we have two equations and two unknowns so we solve the system of equations. Multiply the first equation by -0.7 and add it to the second equation:

$-0.7A -0.7B = -0.7*30$

$-0.7A -0.7B = -21$

$-0.7A -0.7B = -21$

+

$0.2A + 0.7B = 10.5$

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

$-0.5A = -10.5$

$A = \frac{-10.5}{-0.5}$

$A = 21\ gallons$

We substitute the value of A into one of the two equations and solve for B.

$21 + B = 30$

$B = 9\ gallons$

3 0

2 years ago

The rectangle below is dilated by a scale factor of 1/3. Find the perimeter and area of the rectangle below.

Dmitrij [34]

For perimeter you add up the two sides so 15 + 21 equals 36

4 0

2 years ago

I need step by step please 3(x-2)^2+1=13

Romashka-Z-Leto [24]

Answer:

$x_{1} = 0. \: \: \: x_{2} = 4$

Step-by-step explanation:

$3(x - 2)^{2} + 1 = 3$

$3( {x}^{2} - 4x + 4) + 1 = 13$

${3x}^{2} - 12x + 12 + 1 = 13$

${3x}^{2} - 12x + 13 = 13$

${3x}^{2} - 12x = 0$

$x \times (x - 4) = 0$

$x = 0$

$x - 4 = 0$

$\boxed{\green{x_{1} = 0. \: \: \: x_{2} = 4}}$

7 0

2 years ago