Variables and Expressions

Variables and Expressions

by Omar Shishani

Poll

Are you ready to learn Algebra 1?

Multiple Choice

QUICK CHECK:

2.19 + 18.35

• 19.44

• 20.44

• 20.54

• 21.54

Multiple Choice

QUICK CHECK:

$$3\frac{2}{9}+4\frac{2}{9}$$  

• $$7\frac{4}{9}$$  

• $$7\frac{5}{9}$$  

• $$7\frac{4}{18}$$  

Multiple Choice

QUICK CHECK:

$$3\frac{2}{9}+4\frac{2}{3}$$  

• $$7\frac{8}{9}$$  

• $$7\frac{5}{3}$$  

• $$7\frac{4}{12}$$  

Multiple Choice

QUICK CHECK:

Find the quotient of 84 ÷ 6

• 14

• 15

• 16

Multiple Choice

a number decreased by 8

• x - 8

• 8 - x

• x + 8

Multiple Choice

four times a number

• 4x

• 4 + x

• $$x^4$$  

Multiple Choice

a number divided by 8

• x/8

• 8/x

• x - 8

• 8 - x

Multiple Choice

the sum of 9 and a number

• 9 + x

• 9 - x

• 9x

• 9/x

Multiple Choice

5 more than a number

• 5 + a

• 5a

• a - 5

• 5/a

Multiple Choice

3 less than 5 times a number

• 5x - 3

• 3 - 5x

• 3 + 5x

Multiple Choice

twice the sum of 15 and a number

• 2(15 + x)

• 2x + 15

• 2 x 15 + x

• $$x^2\ +\ 15$$  

Multiple Choice

7 increased by the product of 23 and a number

• 23x + 7

• 7x + 23

• 7 - 23x

• 7/23x

Multiple Choice

the product of 6 and n squared

• $$6n^2$$  

• $$6+n^2$$  

• $$6\times2n$$  

Multiple Choice

the difference of n cubed and twelve

• $$n^3-12$$  

• $$3n-12$$  

• $$n^3+12$$  

Multiple Choice

30 increased by 3 times the square of a number

• $$3x^2+30$$  

• $$30\times2\times x+3$$  

• $$30+3x$$  

Multiple Choice

the difference of a number squared and 8

• $$x^2-8$$  

• $$2x-8$$  

• $$x-8^2$$  

Multiple Choice

two third of Majid's age

• $$\frac{2}{3}m$$  

• $$\frac{3}{2}m$$  

• $$2-3m$$  

• $$2+3m$$  

Multiple Choice

two fifths the cube of a number

• $$\frac{2}{5}x^3$$  

• $$\frac{2}{5}\times3\times x$$  

• $$2\times\frac{3}{5}x$$  

• $$x^2\times\frac{3}{5}$$  

Multiple Choice

A used bookstore sells paperback fiction books in excellent condition for $2.50 and in fair condition for $0.50. Write an expression for the cost of buying x excellent-condition paperbacks and f fair-condition paperbacks.

• $$2.5x+0.5f$$  

• $$2.5f+0.5x$$  

Multiple Choice

The lateral area of a right cylinder can be found by multiplying twice the number π by the radius times the height. If a right cylinder has radius r and height h, write an expression that represents the lateral area.

• $$Area=\pi^2\times r\times h$$  

• $$Area=\pi\times r^2\times h$$  

• $$Area=\pi\times r\times h^2$$