What is the combination of two or more waves, which is a result in a single wave?

If square root x = -7, then x= -49 true or false

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b.you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c.you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d.you spend $5 plus $10 per week until you have less than $45.

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