TSI Math 2 questions and answers with complete solutions

TSI Math 2 questions and answers with complete solutions Volume of a Sphere V= 4/3 pi r^3 Volume of a pyramid V=1/3 b* h 00:07 01:38 Volume of a cone V= 1/3 pi r^2 *h Volume of a Rectangular prism V= lwh Volume of a cube V= s^3 Surface Area of a Sphere 4 pi r^2 Surface Area of a Cylinder 2 pi r^2 + pi dh Surface Area of a Rectangular Cube 2 lh + 2hw + 2 lw Surface Area of a Cube S^2 * 6 Area of a Circle Pi r^2 Pythagorean Theorem for Rt. Triangle= a^2*b^2=c^2 Area of a triangle 1/2bh 00:34 01:38 Area of a parallelogram b*h Area of a trapezoid 1/2 *h (b+ b) Circumference of a circle pi* d Change a % to a decimal Move decimal point 2 places to the left EX. 63% = .62 Change a decimal to a percent Move the decimal point two places to the right. EX. .54 = 54% Change a percent to a fraction 25% = 25/100 Change fraction to percent 2/5 = 40/100 Mult. top and bottom of fraction by number that makes denominator 100. (20) Fractions that are mixed numbers or improper fractions equal are greater than or equal to... 100% Finding the percent of a number: 25% of 12 .25 * 12 = 3 , so 3 is 25% of 12 Part/whole method of percent Part/whole= %/100 30 is 75% of what number 30/x = 75/100 and solve for x 10% of 60 = 6 so 20% of 60 = 12 Percent change problems change(difference)/orig. amount =%/100 Mental Math with 10%: what is 20% of 50? 10% of 50=5 therefore: 20% of 50= 10