Solve the following system of equations using the substitution method.
x=4 -2y
4x+8y=20

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Acertain population of bacteria demonstrates exponential growth doubles in size every 4 days. how long will it take the population to triple in size?

If you apply the below transformations to the square root parent function, f(x) = vx, what is the equation of the new function? • shift 12 units right. • shift seven units down.