As you enter the room: 1.Take a piece of paper from the back. 2.Move to your seat quickly and quietly. 3.Begin work on the problems.

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Presentation transcript:

As you enter the room: 1.Take a piece of paper from the back. 2.Move to your seat quickly and quietly. 3.Begin work on the problems.

Using Formulas

Substitute the values into the expression x = -3, y = 4, z =

Using Formulas Goal: 1.Plugging numbers into formulas. We use formulas to calculate values. 2.Use the formula d = rt to solve for different values.

Vocabulary Formula – is an equation that shows the relationship between quantities represented by variables. Distance traveled: d = rt (rate X time)  ALL FORMULA PROBLEMS are solved the same way. PLUG what you know into the formula. SOLVE for what you don’t know.

Questions, questions…. How does a track coach figure out how fast someone….? Distance traveled: d = rt (rate multiplied by time)  ALL FORMULA PROBLEMS are solved the same way. PLUG what you know into the formula. SOLVE for what you don’t know.

How can you remember how to use Distance = Rate x Time?

Examples Use Distance = Rate times Time to solve.. Distance = Rate x Time (d = rt) Suppose you ride your bike at 10 miles per hour for 3 hours. How far did you bike? We have already done stuff like this – just do it! Put the number in for the variable/letter and solve for the ONLY thing left!

Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) Suppose you ride your bike at 8 miles per hour for 4 hours. How far did you bike? We have already done stuff like this – just do it! Put the number in for the variable/letter and solve for the ONLY thing left!

Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) Suppose you ride your bike at 12 miles per hour for 2 hours. How far did you bike? We have already done stuff like this – just do it! Put the number in for the variable/letter and solve for the ONLY thing left!

Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) Suppose you ride your bike at 5 miles per hour for 10 hours. How far did you bike? We have already done stuff like this – just do it! Put the number in for the variable/letter and solve for the ONLY thing left!

Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) Now suppose you rode your bike for two hours and went 18 miles. How fast did you go?

Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) What if you rode your bike for 3 hours and went only 12 miles. How fast did you go?

Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) What if you went 10 miles on your bike and you know you went 5 mph. How long did you ride?

Examples Use the provided formula to solve the problem. Distance = Rate x Time (d = rt) How about you went 21 miles on your bike and you went 3 miles per hour. How long did you bike?

How can you remember how to use Distance = Rate x Time?

Using Formulas Worksheet

Examples Use the provided formula to solve the problem. Use the formula F = + 37, where n is the number of chirps a cricket makes in one minute, and F is the temperature in degrees Fahrenheit. Estimate the temperature when a cricket chirps 76 times in a minute. n __ 4

Examples Use the provided formula to solve the problem. Use the formula F = + 37, where n is the number of chirps a cricket makes in one minute, and F is the temperature in degrees Fahrenheit. The cricket is chirping faster now (120 chirps per minute). What is your estimate of the temperature? n __ 4

Examples Use the provided formula to solve the problem. Find the perimeter of a rectangular tabletop with a length of 14.5 in. and width of 8.5 in. use the formula for the perimeter of a rectangle (P = 2L + 2W, where L is the length and W is the width).

Examples Use the provided formula to solve the problem. The world record strawberry shortcake was huge. It had a length of feet long and a width of 48 inches. What was the perimeter of the cake? Use the formula for the perimeter of a rectangle (P = 2L + 2W, where L is the length and W is the width).

Using Formulas Worksheet