What is 300,000,0000 times 500,000,0000

Solve 13 + w/7= -18 (w/7 is a fraction)

The value, v, of kalani’s stock investments over a time period, x, can be determined using the equation v=750(0.80)^-x. what is the rate of increase or decrease associated with this account? 20% decrease 20% increase 25% decrease 25% increase

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)