(A)=2(75) Look (only) at graph in GC. Doe it increase or decrease? Find quantity Q when t=5. 3 Find time t when G=0.5 • Substitute Q=0.5 isolate exponential • take In both sides. • use log property isolate t calculate • • -round to nearest hundredth Find the half-life. [Time for Q to reduce to half.] Round to nearest hundredth. *You've done this for doubling! It's comparable work for half. *

In the square below, solve for x, y, and z. (15z) (3y) (5x)

(p) The pressure and volume of a gas are related by the equation below. If the volume is increased by 2, the pressure is diminished by 2. Find the pressure and volume. 100 P V (q) A rectangular photograph has an area of 1728 square cm. If the diagonal is 60 find the length and width and angles of the diagonal. (r) Concrete contracts as it dries. If the volume of a cubical concrete block is 28.5 cubic cm less and each edge is 0.1 cm less after drying, what was the original length of an edge of the block? Set up equations and solve. ASUS VivoBook f6 f80/ Home/Debut f9 End/Fin f10 PoUp/P.prec. f1

Solve the quadratic equation by using the square root property. (Enter your answers as a comma-separated list.) (x – 2)2 = 7 X =