Ratios & Proportions
A __________ is a comparison of two quantities.
What is a Ratio?
Solve: |4| + |-3| - (-6) = _____________
What is 13?
You can only combine terms if they are ______ terms.
What are "like terms"?
What is the formula for area of a triangle?
a=(bxh)/2 OR a=1/2(bh)
A ___________ states that two ratios are equivalent.
What is a proportion?
Rational or Irrational?
√ 2
Irrational
(-2x) + 3x - 4x
-3x
Formula for area of a circle
a=3.14r2
The amount of hours Kaylie works is directly proportional to her money earned. She earns $24 when working 2 hours. How much money will she earn when she works 6 hours?
$72
Rational or Irrational?
√ 100
Rational
A sandwich costs $5. The owner wants to increase the cost by 10% to gain more profit. Find the increased cost.
What is the perimeter of a circle called? What is the formula?
Circumference
3.14(diameter)
What kind of line represents a direct proportion in a graph?
A straight line
On Monday, the temperature was negative 3 degrees F in Alaska and 72 degrees F in Delaware. What is the difference between the temperatures?
75 degrees difference
Simplify:
y + 10y -3x +2y - x = __________
13y - 4x
If you measure the surface area of a cylinder and subtract the areas of the two bases, you are really finding the ______________________.
What is lateral area?
What is the equation for a direct proportion? Identify which variable represents the constant.
y = kx
k is the constant
0.2 x 5 x (-3) = _________
-3
Factor the expression:
20z + 30yz
10z (2 +3y)
Formula for surface area of a cylinder