Question

Oricate e perfect.Va rog!
9-13

Answer 1

9.

2x-5<3x

-5<x

=> A. (-5, infinit)

10.

2x=49-11

2x=38

x=38:2

x=19 => C.

11.

x/y=1/5

x+y= 90

x+y/y= 1+5/5

90/y=6/5

y=90x5/6

y=450/6

y=75

=> x= 90-75

x=15 => D.

bafta!