Urgent pls

M bad at math

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2

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