2 Formulas and Problem Solving > Solve for the unknown variable in each formula. Use 3.14 as an approximation for / when > Solve algebraically: necessary: It is 328 miles from NY to Baltimore. How long should it take Sharene to drive round trip, if Keep this in Mind! 1) V= =ard, whenr = 5 2) A = =h(6 + b], when A = 117, 6 = 15 and b = 11 she is driving 64 miles per hour? In the last lesson we needed to write and solve equations, sometimes just by using a formula and substituting we can use arithmetic to solve the problem. Notice when the directions say "solve algebraically" we must set up an equation to solve the problem. >Revisiting the Challenge Problem: Great white sharks have triangular teeth. The height of one of these teeth is 6 centimeters Example: and its area is 15 square centimeters; what is the measure of the base of this tooth? 3) m= 2 , when y2 =7, y1 =-3, x2 = 2 and x1 = 5 The formula F = = C + 32 can be used to convert Celsius to Fahrenheit temperatures. Convert 48"c to Fahrenheit. >Solve for the unknown variable in each formula. Use 3.14 as an approximation for it when necessary: 1) V= =mr'D, when V = 47.1 and r= 3 2] A= =h(8 + b), when A = 45.5, B = 8 and h = 7 Solve algebraically: The length of a rectangular garden is 20 feet. The area of the garden is 300 square feet; Example: what is the width of the garden? A building contractor is to dig a foundation 12 feet long, 9 feet wide and 6 feet deep for a toll booth. The contractor pays $10 per load for trucks to remove the dirt. Each truck holds 162 cubic feet. What is the cost to the contractor to have all the dirt hauled away? 3) m= 42 , when m = =, y1= 3, x2 = 7 and x1 =-2 >Example: Which has more pie, one 15-inch pie or two 9-inch pies? (The size indicates the diameter of the round pie). >Challenge Problem: What happens to the volume of a cylinder when the radius is tripled