A restaurant makes cornbread. For each batch of cornbread 3/4
cups of sugar is needed. If the chef used 21 cups of sugar, how
many batches of cornbread did he make?

4+6x-3x^3 in standard form with explanations because i don’t understand

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip