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GRE Math
Question | Answer |
---|---|
What is Simple Interest | Based on initial Deposit, called the principal, for the entire time period. If amount P is invested at a single annual interest rate of r percent, then the value V of the investment at the end of t years. |
What is the equation for Simple Interest? | V = P (1 + (rt)/100) |
What is Compound Interest? | Interest added to principal at regular time intervals (annually, quarterly,monthly). Each time interest is added to the principal, the interest is said to be compounded. |
What is the equation for Compound Interest when amount P is invested at an annual interest rate of r percent, compounded annually? | V = P (1 + r/100) ^t |
What is the equation for Compound Interest when amount P is invested at an annual interest rate of r percent, compounded n times per year? | V = P( 1 + r/ (100n)) ^ (nt) |
What is the coordinates for the y intercept? | (o, y) |
What is the coordinates for the x intercept? | (x, 0) |
What are the conditions for two lines to be parallel? | Their slopes are equal |
What are the conditions for two lines to be perpendicular? | slopes are negative reciprocals of each other |
What is the equation for the area of a right triangle? | A = (1/2) * b * h |
What is the equation for the area of a rectangle? | A = b * h |
What is the equation to find the sum of interior angles of a polygon? | n =# sides of polygons Sum of interior angles = ( n - 2 ) * 180 |
What is an isosceles triangle? | Triangle with two congruent sides and 2 congruent angles. The 2 congruent angles are attaches to the two congruent sides and the side that is not congruent |
What is the pythagorean theorem? | a^2 + b^2 = c^2 CAN ONLY BE USED ON RIGHT TRIANGLES |
What is the area of a triangle? | 1/2 * b * h |
What is the area of parallelograms, squares, and rectangles? | b * h |
What is the equation for the area of a trapezoid? | A = (1/2) * (b1 + b2) * h |
What is the equation for the circumference of a circle? | C = 2 * pi * r |
What is the equation for the volume of a rectangular solid or a cube? | V = l * w* h |
What is the equation for the surface area of a rectangular solid or a cube? | SA = 2 ( lw + lh + wh) |