Alex has three times as much money as jennifer. jennifer has $12 less than shannon. together they have $91. how much money does alex have?

Alex has $47.4

Step-by-step explanation:

Let a=alex, j=jennifer, and s=shannon.

a=3j

j=s-12

j+s+a=91

Substitute s-12 for j in the first equation to get a=3(s-12). Now substitute this equation and the second into the third.

s-12+3(s-12)+s=91

Simplify to get 5s-48=91

s=27.8 Substitute this into a=3(s-12) to get a=47.4

2.

according to newton’s cannonball model, what happens if the cannonball's velocity is enough to overpower the pull of earth’s gravitystep-by-step explanation:

the answer is y < -3 or   y > 3

-3y > 7 + 2

-3 y > 9

y < -3