Which of the following functions represent exponential decay?
y = 2x
y = -2x
y = 1/2^x
7 = 2^0.5x

answer: the answer is (d)

step-by-step explanation:   we are given four functions and we are to select which one represent exponential decay.

the functions represents straight lines, and so there is no exponential growth or decay. these two functions are graphed in the attached figure.

the function both are exponential functions, where the first one shows exponential decay because as the value of x increases, the value of y is decreasing and the second shows exponential growth, because x and y increases or decreases simultaneously. see the attached figure.

thus, the correct option is (d)

25

step-by-step explanation:

a and c

step-by-step explanation: