Divide 81/20 how to divide please give step by step explanation ​

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)

In a timed typing test lara typed 63 words per minute.estimate the number of words she should be able to type in half in hour show your work