Math question can you please help and can you breakdown how you got your answer

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Beth divided 9 ounces of her granola recipe into 4 equal-sized amounts. she placed the amounts into individual bowls. the fraction 9/4 represents the number of ounces of granola in each bowl. which other number represents the amount of granola beth has in each bowl? (a) 1 1/4 (b) 2 1/4 (c) 1 3/4 (d) 3 3/4 i need !