The fraction model below the steps that a student performed to find a quotient. Which statement best interprents the quotient.

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Can someone answer this question for me

Ahypothesis is: a the average squared deviations about the mean of a distribution of values b) an empirically testable statement that is an unproven supposition developed in order to explain phenomena a statement that asserts the status quo; that is, any change from what has been c) thought to be true is due to random sampling order da statement that is the opposite of the null hypothesis e) the error made by rejecting the null hypothesis when it is true