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)

definition: a circle is the  set of all points in a plane that are equidistant  from a given  point  called the center of the circle. we use the symbol ⊙ to represent a circle. the a line segment from the center of the circle to  any point  on the circle is a radius of the circle.

step-by-step explanation:

i googled it and this is what i got i don't know how it is. sorry.