Charles is 19 years old. his grandfather is 67 years older than he. what was thee total age 9 years ago?

87 years

Step-by-step explanation:

To find the total age 9 years ago you would subtract 9 from Charles's age only, 19. His grandfather is still always going to be 67 years older than he.

19 - 9 = 10

Add 10 and 67 together to find his grandfather's age back then.

10 + 67 = 77

Now add 10 and 77 together.

10 + 77 = 87

The total age 9 years ago was 87 years.

The independent variable is the amount of salt in the diet, and the dependent variable is blood pressure. The answer is letter D. Independent variables do not depend on the effects of the dependent variable whereas dependent variables depend on the input of the independent variable. It more like the ‘effect’ it does on the independent variable.