(7x^3)(3x^7) your answer should be a monomial in standard form

If you answer right ill give brainliest, : )

Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39