8.) Sum: the product of two added factors
2 times: Multiplied by 2
The answer is [tex]2(a + b)[/tex]
9.) We know Jack currently has $205. It says he spends $2 each day. This means that each day his current value changes by -$2.
This means your answer is [tex]205 - 2d[/tex]
10.) If $55 is the total amount you are spending, then this means you put it on the right side of the equation:
[tex]x + y + z = 55[/tex]
Each book is $7.50, so you are buying b books.
Each pencil is $3, so you are buying p pencils.
Each eraser is $2, so you are buying e erasers.
This means that [tex]7.50b + 3p + 2e = 55[/tex]
