In a certain triangle, one angle has a measure of 30° and another angle has a measure of 120°. if the triangle is isosceles, then which of the following could be the measure of the third angle?

a. 120°
b. 60°
c. 30°
d. 75°

The answer is C because an isosceles triangle got up to 180 degrees and 120 + 30 is 150 and 150 + 30 is 180 so therefore your answer is C

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form