Which definition best describes vertical angles? a. a pair of angles that combine to form a straight angle b. a pair of angles whose sum is c. a pair of angles whose sum is d. a pair of opposite angles formed by intersecting lines

Option D: a pair of opposite angles made by two intersecting lines.

Step-by-step explanation:

In geometry, a pair of angles is said to be vertical if the angles are formed from two intersecting lines and the angles are not adjacent. The two angles share a vertex. Such angles are equal in measure and can be described as "equal" or "congruent". Vertical refers to the vertex (where they cross).

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5

80x^8−68x^6+16^5−20x^4−4x^3+8x^2

hope i'm right lol