Question

Hellpppp ASAP. Plzzzz

Answer 1

6 is from the beginning. Multiply first, not add

Explanation:

Answer 2

6)

`5+3(y-4)=5(y+2)-y\\\\5+3y-12=5y+10-y\\\\-7+3y=4y+10\\\\y=-17`

The error was made by combining the 5+3(y-4) without first distributing the 3 to both the y and -4.

7)

a)

`A(t)=0.30t+45\\B(t)=0.25t+60`

b) Now we can set each equal to 150 and solve for t

`150=0.30t+45\\\\0.30t=105\\\\t=(105)/(0.30) \\\\t=350`

Rob can send 350 texts per month with plan A

`150=0.25t+60\\\\0.25t=90\\\\t=(90)/(0.25) \\\\t=360`

Rob can send 360 texts per month with plan B

c)

`A(100)=0.30(100)+45\\\\A(100)=30+45\\\\A(100)=75`

`B(100)=0.25(100)+60\\\\B(100)=25+60\\\\B(100)=85`

If Rob were to send 100 text messages a month, Plan A would be cheaper