Which function represents exponential decay with 5% as the rate of decrease?

The function that represents exponential decay is y = 50 ⇒ B

Step-by-step explanation:

The form of the exponential growth function is y = a

The form of the exponential decay function is y = a

∵ The function represents exponential decay with 5%

→ By using the second rule above

∴ y = a

∵ The rate of decrease is 5%

∴ r = 5%

→ Change it to decimal by dividing it by 100

∵ 5% = 5 ÷ 100 = 0.05

∴ r = 0.05

→ Substitute it in the equation

∵ y = a

∴ y = a

→ Look at the answer to find which equation is written in this form

∴ y = 50

∴ The function that represents exponential decay is y = 50

the formula of a slope:

we have the points (-2, 7) and (2, 3). substitute: