From Kaplan's 100 Key Math Concepts for the ACT - the ones that I didn't know :D
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Undefined Numbers | on the ACT, almost always means division by zero
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| Imaginary Numbers | on the ACT, almost always means numbers that involve the square root of a negative number
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| How do you solve a rates problem? | By using a proportion.
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| What is the trick to finding the average of evenly spaced numbers? | Average the smallest and the largest numbers.
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| How do you find possibilities? | Multiply the different elements factoring into the possibility by each other.
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| How do you solve a system of equations | Multiply one of the equations so that when added to the other equation, either x or y cancels out.
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| What is slope intercept form? | y=mx+b
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| How do you find the slope-intercept of y or x? | Plug x or y (respectively) into the equation and solve.
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| What is the equation for a circle? | (x-h)^2 + (y-k)^2 = r^2
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| Name the two special right triangles that correspond with the length of the legs. | 3-4-5 and 5-12-13
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| The sides of a 30°-60°-90° triangle are in a ratio of.... | 1:√3:2
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| The sides of a 45°-45°-90° triangle are in a ratio of.... | 1:1:√2
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| Formula for the area of a trapezoid | (b1+b2/2)xh
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| The fundamental trigonometric identity: | sin^2x + cos^2x=1
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