Question

Hello , please help ( see image!)

Answer 1

A=2.5x10^2 A=250
B= x^2/10

Answer 2

250 and 10

Explanation:

substitute x = 10 into the expressions

a =
`(5x^2)/(2)`

=
`(5(10)^2)/(2)`

=
`(5(100))/(2)`

=
`(500)/(2)`

= 250

-----------------------------------------------

b =
`(2x^2(x-5))/(10x)`

=
`(2(10)^2(10-5))/(10(10))`

=
`(2(100)(5))/(100)` ( cancel 100 on numerator and denominator )

=
`(2(5))/(1)`

= 10