Write the polynomial in descending order : 5a^2b – 13ab + 7a^3 – 4b

Could someone with number 1 and 2

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

The numbers on a football field indicate 10 yard increments. you walk around the perimeter of a football field between the pylons. you walk a distance of 30623 yards. find the area and perimeter of the indicated regions. write your answers as mixed numbers, if necessary. a. one end zone: perimeter: yd area: yd2 b. the playing field (not including end zones): perimeter: yd area: yd2 c. the playing field (including end zones): perimeter: yd area: yd2