What is (6.648 x 10 to the power of 9) - (2.9 x 10 to the power of 7) in scientific notations

Aconvex octagon has interior angles that measures 73 degrees, 172 degrees, 132 degrees, 59 degrees, 154 degrees, 163 degrees, x degrees, 2x degrees find the value of the missing angles

Find the slope of the line y =8/9x + 1.

Given the conditional statement, match the following. conditional statement: if two lines intersect, then their intersection is one point.