This is the question

A = 3.14 * 8^2/2. 8^2 is 64, so A = 3.14 * 64/2. Simplified, that's A = 200.96/2, which is 100.48. Therefore, the area of this semicircle is 100.48 square inches. In other words, the space that the semicircle encloses consists of 100.48 square inches.

Triangle area would be 60

formula=1/2bh

160.48 is the area total

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Step-by-step explanation:

- 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