October 20, 2015
2-5a Literal Equations and
Formulas
Warm-Up
In your own words, what is a formula?
Write down as many mathematical formulas that you can
think of.
October 20, 2015
October 20, 2015
Problem 1 Rewriting a Formula
Solve the distance formula d = rt formula for t.
How many hours did it take for a car to go 2400 miles if it
was traveling at an average speed of 45 mph. Round you
answer to the nearest tenth if necessary.
How many hours did it take for a car to go 2400 miles if it
was traveling at an average speed of 65 mph. Round you
answer to the nearest tenth if necessary.
Got It?
Ohm's Law (V = IR) where v represents voltage, I represents
current, and R represents resistance is a very important
formula in circuit analysis and design. Solve Ohm's Law
for I.
A nine volt battery supplies power to a cordless curling
iron with a resistance of 18 ohms. What is the current
flowing through the battery.
October 20, 2015
Problem 2 Rewriting a Geometric Formula
Solve the circumference formula for r.
What is the radius of a circle with a circumference of 64 ft?
Round you answer to the nearest tenth and use 3.14 as pi.
What is the radius of a circle with a circumference of 92 ft?
Round you answer to the nearest tenth and use 3.14 as pi.
You Try
Solve the Volume of a rectangular prism formula for h.
What is the height of a prism that has a volume of 360 in3. a
length of 6 in. and a width of 5 in.?
What is the height of a prism that has a volume of 1350 in3.
a length of 10 in. and a width of 15 in.?
October 20, 2015
Problem 3
Rewriting a More Complicated Formulas
Solve the Perimeter of a rectangle formula for h.
Solve the Area of a Trapezoid formula A=1/2(b1+b2)h for b1.
a. Solve the Area of a triangle formula h.
Got It?
What is the height of a triangle with an area of 24 in2. and a
base of 8 in.?
b. Solve the temperature formula C = (5/9)(F - 32) for F.
A
October 20, 2015
Section: 2-5a
Problems: All Problem at the
end of the notes
Solve the formulas for the given variable on the left. Then answer the questions on the right
using your formula. If needed round your answers to the nearest tenth and use 3.14 as pi.
October 20, 2015
October 20, 2015
Answer all parts of the following problems.