What are these expressions simplified

1. 6t + 7i + 5t + 7i

2. 3x + 6y + 2y +8x

3. a + 2c - 8a

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

Given ab and cb are tangents of p, and m =10°. what is the measure of abp?

How do i put 3(x+7) in distributive property