What is the answer for both 6 and 8

The sales totals at macy's food store have increased exponentially over the months. which of these best shows the sales in the first three months?

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)