∠a and ∠b are vertical angles with m∠a=x and m∠b=5x−80 . what is m∠a ?

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

How do you write 600 as a product of its prime factors (index! )

Long division setup showing an incomplete calculation. 12 is in the divisor, 6839 is in the dividend, and 5 hundreds and 6 tens is written in the quotient. 6000 is subtracted from 6839 to give 839. an unknown value represented by a box is being subtracted from 839. what number should be placed in the box to complete the division calculation?