Consider the following function.

f(x) = (4 − x)e−x

(a) find the intervals of increase or decrease. (enter your answers using interval notation.)

increasing
decreasing (b) find the intervals of concavity. (enter your answers using interval notation. if an answer does not exist, enter dne.)concave up concave down

answer is x<

let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt

step-by-step explanation:

the answer is 128

4

step-by-step explanation:

im pretty sure it's 4 beacsue 8/2 equals 4