❓❗❓❗PLEASE HELP ASAP❓❗❓❗ (3z^3 – 4z + 7z^2) + (8z^2 - 6z - 5)

Simplify (8x^3 - 5x+1)-(x^2+4). Show your work

Simplify the product 4x(5x^2+ 3x +7).
Simplify and write in standard form

40 points. given: two congruent angles ∠c and ∠r are supplementary. prove: ∠r and ∠c are both right angles. it doesn't have to be exactly 10 rows.statements reasons1. 1. 2. 2. 3. 3. 4. 4. 5. 5. 6. 6. 7. 7. 8. 8. 9. 9. 10. 10.

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?

Round each decimal to the nearest thousandth. a. 5.39562 b. 0.12345 c. 5634 d. 18.93763