Which of the following are not accepted without proof in a logical system?

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

Seattle, washington is known for being rainy. one day last month, 8 inches of rain fell in 1 1/2 hours. what us the rate of the rainfall expressed in ft per plzzz write a proportion i will give you 100 points

What are two numbers that have a sum of 15