6.43999001 *10 ^8 in standard form

Describe the relationship between the angles of similar triangles and the sides of similar triangles

Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.