Solve for x: |2x 6| − 4 = 20 (1 point) select one:
a. x = 9 and x = 11
b. x = −9 and x = 15
c. x = 9 and x = −15
d. no solution

Ineed with number 6 , explain how to get 1978

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0

Write the summation to estimate the area under the curve y = 1 + x2 from x = -1 to x = 2 using 3 rectangles and right endpoints