In a class, the ratio of girls : boys is 5:3. What fraction of the class are boys?

please answer urgent , high points up for grabs , please give good explanation

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

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

Find the value of the variable and the length of each chord for #5 and #6.