What value of x will make the equation true? (square root of 5) (square root of 5)=x

please help me :)

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)