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3 years ago

Find the incorrect step in each solution and explain whit it is incorrect.

Mathematics

1 answer:

julsineya [31]3 years ago

3 0

Answer:

Step-by-step explanation:

Mai:

She subtracted 5x instead of distributing. This is incorrect, because since it is in ( ), it has to be multiplied by 3.

Correct: 3(5x + 9) = 15x + 27

12x + 3 = 15x + 27

Noah:

Added 15x instead of subtracting. This is incorrect, because to combine like terms on each side you would add a negative number and subtract a positive number.

Correct: 12x + 3 = 15x + 27

12x - 15x = 27 - 3

-3x = 24

x = 24 / -3

x = -8

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r-ruslan [8.4K]

First step:
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-4(3+11v)
Second step:
apply the distributive property:
-12-44v
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3 years ago

The length of the base of a triangle is twice it’s height. If the area of the triangle is 441 square kilometers, find the height

Sonja [21]

Answer:

21 kilometers

Step-by-step explanation:

Let the height be $x$ . Then, the length of the base is $2x$ . The formula for the area is of the triangle is given by base*height/2. Therefore, the area of the triangle is equal to $\frac{x \cdot 2x}{2} = x^2$ , which is in turn equal to 441. Since $x$ must be positive, then $21^2=441$ , meaning that the height is $21$ kilometers.

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3 years ago

Just Peachy Orchard produced 1100 bushels of peaches last year. This year the owner earned $8800 from sales. He's thinking that

Slav-nsk [51]

Answer:

$P(t) ={8*(1.01)^t}$

Step-by-step explanation:

The number of bushels produced is given by:

$B(t)= 1100(1.1)^t$

The owner's income is given by:

$S(t) = 8800(1.111)^t$

Income is given by the price per unit multiplied by the number of units sold. Therefore, the price function can be represented as:

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3 years ago

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Answer:

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Step-by-step explanation:

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Answer:

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7 0

3 years ago