5^x + 5^x+1 = 150
Find x

You are designing a rectangular pet pen for your new baby puppy. you have 30 feet of fencing you would like the fencing to be 6 1/3 feet longer than the width

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

Pls never taught i’m really confused and i rlly need