21. Write an explicit formula for the sequence 7, 2, -3, -8, -13,... Then find a 4- a. a. =- 5n+ 12: -53
c. an = - 5n + 12: - 58
b. a = - 5n + 7: 58
d. a = - 5n +7; 63

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image

Ramona had money to spend during a visit with her grandparents. she recorded how much money she had left y, in dollars, after each day x. how much money did ramona originally have to spend?

Brianna is getting materials for a chemistry experiment. her teacher gives her a container that has 0.15 liters of a liquid in it. brianna needs to use 0.4 of this liquid for the experiment. how much liquid will brianna use?