Answer:
The person invested $3500 at 7% and $2500 at 5%
Step-by-step explanation:
We can say that
because the investment is equal both in one as in another, where x is the income from the investment.
Solving the equation we have:

Then to get the incomes:
At 7%: 
And at 5%: 
Finally we can demonstrate the answer because the income at 7% + income at 5% are 3500+2500=$6000
The second i think you did good
Answer:
Step-by-step explanation:
<u>Given</u>
- Dimension of the prism: 3x4x6
- Side of each small cube: 1/2 mm
<u>Volume of the prism in terms of the number of small cubes:</u>
<u>Volume of each unit cube:</u>
<u>Volume of the prism:</u>
Correct choice is D
Variables are like a substitute for a number