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?

The amount of money that Alex has is $47.4

Step-by-step explanation:

Let

x> amount of money that Alex has

y> amount of money that Jennifer has

z> amount of money that Jennifer Shannon has

we know that

x+y+z=91 > equation A

x=3y > equation B

y=z-12 > z=y+12 > equation C

substitute equation B and equation C in equation A and solve for y

(3y)+y+(y+12)=91

5y=91-12

y=79/5

y=$15.8

Find the value of x

x=3y > x=3(15.8)=$47.4

sounds & other waves originate from any vibrating object

i think the answer is a p = 78

step-by-step explanation:

there are 6 sides of a hexagon, multiply 13 x 6