Hi, does anyone know how to do question 73 and b. If so, please show the working out thankyou.

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

The graph of f(x), shown below, resembles the graph of g(x) = x2, but it has been changed somewhat. which of the following could be the equation of f(x)?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?