Question

An environmentalist tracks the total number of trees y in a park after x years of a planting program. The line of best fit for the data is represented by the equation y = 3x + 15. What is the percent change in the total number of trees from x = 4 to x = 7? Round your answer to the nearest percent.

Answer 1

Answer:

33.33%

Step-by-step explanation:

The line of best fit for the data is represented by the equation y = 3x + 15.

At x = 4,

y = 3(4) + 15 = 27

At x = 7,

y = 3(7) + 15 = 36

We need to find the percent change in the total number of trees from x = 4 to x = 7.

So,

$\%=\dfrac{36-27}{27}\times 100\\\\=33.33\%$

So, the required percentage change is equal to 33.33%.

Answer 2

GIVEN:

The line of best fit for the data is represented by the equation y = 3x + 15.

ANSWER:

For x = 4,

• y = 3 × 4 + 15 = 27.

For x = 7,

• y = 3 × 7 + 15 = 36.

Now, percent is

• 36 - 27/27 × 100
• 9/27 × 100
• 100/3
• 33.33%