Miscellaneous
What is a letter used to represent an unknown number called?
A variable
142=
196
4x= 3
x = 3/4 or 0.75
The radius of a circle is 13 cm. What is its circumference in terms of pi?
26pi cm
Units must be included for points
What is the difference between an expression and an equation?
Expression has no equal sign, equation has two expressions connected with an equal sign
What is the square root of 121?
11
5x - 7 = 23
x=6
The area of a circle is 64pi in2. What is its diameter?
16 inches
Units must be included for points
What are like terms?
Terms with the same variable (and power) - such as 4 and 7, or 5x and 3x, or 5x2 and 9x2
What is the cube root of 27?
3
15x + 25 = 30
x = 1/3
A circle has a radius of 1.5 cm. What is it's area? Use 3.14 to approximate pi
7.065 cm2
Units must be included for points
What are the 3 sets of inverse operations?
Addition/subtraction
Multiplication/division
Squaring/square root
73 / 7 =
49
5/4 x - 3 = 7
x=8
The circumference of a circle is 4pi cm. What is the area? Use 3.14 to approximate pi
12.56 cm2
Units must be included for points
What is the number directly in front of a variable called?
Coefficient
122 - 82 =
80
4(2x+7)=60
x=4
Circle A has an area of 169pi m2. Circle B has a radius that is half the radius of Circle A. What is the area of Circle B? You may leave your answer in terms of pi
42.25pi m2
Units must be included for points