Farmer John needs to build a new watering trough for his horses. He has laid out a diagram on grid paper so he knows how much material to buy. If each unit mark represents 1 foot, what is the total square footage of material he needs to buy?
A)
2A²
B)
8 ft²
C)
12 ft?
D)
16 ft?
Geometry and Measurement

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

Determine whether the points (–3,–6) and (2,–8) are in the solution set of the system of inequalities below. x ? –3 y < 5? 3x + 2 a. the point (–3,–6) is not in the solution set, and the point (2,–8) is in the solution set. b. neither of the points is in the solution set. c. the point (–3,–6) is in the solution set, and the point (2,–8) is not in the solution set. d. both points are in the solution set.

What is the value of x when x + 7 = 21?