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Ira Lisetskai [31]
3 years ago
12

If x=8 and y=−2, evaluate the following expression: 3x−y2

Mathematics
1 answer:
jok3333 [9.3K]3 years ago
8 0

Answer:

=28

Step-by-step explanation:

3(8)-(-2)2

24- -4

=28

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(4x-9)(12x-3) FOIL or double-distribute
lora16 [44]

Answer:

Simplifying

4x + 9 = 12x + -3

Reorder the terms:

9 + 4x = 12x + -3

Reorder the terms:

9 + 4x = -3 + 12x

Solving

9 + 4x = -3 + 12x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-12x' to each side of the equation.

9 + 4x + -12x = -3 + 12x + -12x

Combine like terms: 4x + -12x = -8x

9 + -8x = -3 + 12x + -12x

Combine like terms: 12x + -12x = 0

9 + -8x = -3 + 0

9 + -8x = -3

Add '-9' to each side of the equation.

9 + -9 + -8x = -3 + -9

Combine like terms: 9 + -9 = 0

0 + -8x = -3 + -9

-8x = -3 + -9

Combine like terms: -3 + -9 = -12

-8x = -12

Divide each side by '-8'.

x = 1.5

Simplifying

x = 1.5

Step-by-step explanation:

6 0
4 years ago
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Is the relationship between the height of a tree in the time since the trees planted linear or unconnected points
Mashcka [7]

Answer:

Linear

Step-by-step explanation:

Growth has a linear increase

5 0
2 years ago
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The volume of a cube is 8073 cm3.<br> Work out an estimate for its surface area
Gemiola [76]

Answer:

2414.42 cm^2

Step-by-step explanation:

volume = base x height

and we know that a cube will always have the same length for any side so volume is basically length^3

volume = length^3

8073 = x^3

x = \sqrt[3]{8073}

use a calculator and you get that x = 20.06 cm

Surface area(SA) = 6a^2 (a is area)

a = x^2

so SA = 6(20.06)^2 = 2414.4216 ≈ 2414.42 cm^2

6 0
3 years ago
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What is 0.3x-2 equal
Rom4ik [11]

Answer:

i think -0.6

Step-by-step explanation:

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3 years ago
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It takes 20 hours and $400 to interview a candidate
erma4kov [3.2K]

Answer:

Not sure what this question is asking but for the hourly rate, the answer is $20.

Step-by-step explanation:

You can write an equation as 20x=400.

Simply solve it by dividing each side by 20 to find the hourly rate in dollars per hour.

You get x=20 as your answer so 20 dollars per hour!

Hope this helps! :)

3 0
4 years ago
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