Answer:
each of his parents are 42 years old.
Step-by-step explanation:
1) The variables are "k"
2) There are 4 terms
3) The coefficients are k
4) The constants are -7, 3, 10, -5
5) The like terms is -7k, 3k, 10k, -5k
The answers are pretty direct but, hope this answers your question.
Have a great day/night!
Answer:

Step-by-step explanation:
Use these formulas

Now solve

Because you can't divide 5 evenly
Answer:
No
Step-by-step explanation:
Because 0.3 is a decimal and 18 is a whole number.
0.3 = 3/10 which is 30%