Please solve these for me I'm due on Thursday:( 9) 2x 2− 3x − 15 = 5
10) x 2+ 2x − 1 = 2
11) 2k 2+ 9k = −7
12) 5r 2= 80
13) 2x 2− 36 = x
14) 5x 2+ 9x = −4
15) k 2− 31 − 2k = −6 − 3k 2− 2k
16) 9n 2= 4 + 7n
17) 8n 2+ 4n − 16 = −n 2
18) 8n 2+ 7n − 15 = −7

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50.

The length of the line segment ac is 8x-9 what is the value of x

Ahigh-altitude spherical weather balloon expands as it rises, due to the drop in atmospheric pressure. suppose that the radius r increases at the rate of 0.02 inches per second, and that r = 36 inches at time t = 0. determine the equation that models the volume v of the balloon at time t, and find the volume when t = 360 seconds. v(t) = 4π(0.02t)2; 651.44 in3 v(t) = 4π(36 + 0.02t)2; 1,694,397.14 in3 v(t) = four pi times the product of zero point zero two and t to the third power divided by three.; 4,690.37 in3 v(t) = four pi times the quantity of thirty six plus zero point zero two t to the third power divided by three.; 337,706.83 in3