Please Simplify these expressions:
1. 2a + 10 - 6 + 4a
2. -7 + 3x - 5x + 7
3. -5(3b - 2) + 10b
4. -8 - 4d + 3b - 6 + d

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6

The radius of the circle below intersects the unit circle at (3/5,4/5). what is the approximate value of theta? 0.6 radians 1.0 radians 36.9 degrees 53.1 degrees