What 2 numbers should be used to find 231 - 198 using the 10 method for subtracting quickly in your head? Select the correct response.

Count 15 and then count 18 more.

0 Count 20 and then count 13 more.

O Count 11 and then count 22 more.

Count 2 and then count 31 more.

15 points ! ~ see if you know the answer to both you!

Triangle xyz has vertices x(1,3), y(0,0)

Find the volume of the described solid. the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x. a) 441b) 147c) 864d) 882