Step-by-step explanation:
6)

7)

8)


9)

Answer:
z
Step-by-step explanation:
the y' should be 5 then 10 .20.40.80 since it double every day
<span>(3b - 5x)(a +3) is the answer
</span>
Answer:
19b-4
Step-by-step explanation:
7b+3(4b-2)+6÷3
Bracket comes first so we distribute 3 over the terms in the bracket
= 7b + 12b -6 +6 ÷ 3
First we solve division
= 7b + 12b -6 +6 ÷ 3
= 7b + 12b -6 +2
= (7b+12b)+(-6+2)
= 19b -4
This can't be simplified further as it can't be solved anymore