Which equations illustrate the commutative property of multiplication?

choose exactly two answers that are correct.

a.

b.
–8 • (4 • 1) = (–8 • 4) • 1

c.
–4 • (5 + 7.1) = –4 • 5 + (–4) • 7.1

d.
–8 • (5 + 3.1) = (5 + 3.1) • (–8)

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation:

step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value