1. AIM: Using Formulas
Do Now
Weekly Quiz #9
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4. Anticipatory Set:
How have you seen formulas used in the real world?
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5. Using Formulas- Formulas are equations that show the relationship
between quantities that are represented by variables.
The formula to find the area of a rectangle is
Area = base • height
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6. Draw a sketch and use the formula to solve the following problems.
1. The length of a rectangle is 4 and the width is 8. What is the
area?
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7. 2. The area of a rectangle is 48 and the length is 8. What is
the width?
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8. 3. The width of a rectangle is 9 and the area is 135. What is the
length?
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9. 1
d = rt, where d = distance, r = rate,
and t = time
If you travel at 4 feet per second for 138 second, what is the
distance traveled?
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10. 2 d = rt, where d = distance, r = rate,
and t = time
If you traveled 612 miles in 12 hours, what was the speed?
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11. Egg Density
Mass of egg = ____
Volume of Egg = ___
Density of
Water = 1 g/mL
Will a soda can float in water?
Soda Density
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12. 3
The formula for finding density of an object is , where
d = density, m = mass, and v = volume.
What is the density of an object if the volume is 4 cm3 and the mass
is 64 grams?
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13. 4
The density of silver is about 11 g/cm3. What would the mass
of a silver sample be if the volume is 45cm3?
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14. 5
You find the volume of a sample of copper to be 35 cm3. The
density of copper is about 9 g/cm3. What would the mass of your
sample?
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15. BEFORE YOU LEAVE
14 ft
20 ft
1. Find the perimeter of the rectangle above
2. Write a formula to find the perimeter of any rectangle.
Combine any like terms to express the formula in simplest form.
Let P = Perimeter
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16. BEFORE YOU LEAVE
PART 2
3. What is the perimeter of a rectangle whose length is 16
inches and width is 2.5 inches? Use the formula.
4. What if the perimeter was 20 and the length was 3? Use
the formula.
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17. Mr. Tjersland's Math 7
Homework: Homework Sheet
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18. AIM: Using Formulas
d = rt, where d = distance, r = rate,
and t = time
If you travel at 4 feet per second for 138 second, what is the
distance traveled?
If you traveled 612 miles in 12 hours, what was the speed?
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19. AIM: Using Formulas
The formula for finding density of an object is , where
d = density, m = mass, and v = volume.
What is the density of an object if the volume is 4 cm3 and the mass
is 64 grams?
The density of silver is about 11 g/cm3. What would the mass
of a silver sample be if the volume is 45cm3?
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