Factored by grouping
(3a - 7) (a + 1)
Answer:
Below in bold
Step.-by-step explanation:
It consists of 5 isosceles triangles of equal sides 4 cm and vertex angles 360 / 5
= 72 degrees.
Area of 1 triangle = 1/2 * 4^2 *sin 72
Area of the whole pentagon = 5 * 1/2 *4^2 * sin 72
= 38.04 cm^2.
It would equal 1
Explanation
- keep (keep first fraction the same)
- change (change division to multiplication)
- flip (flip the last fraction)
