Evaluating
Evaluate the expression when x=6 and y=5
x + 7
13
Write the phrase as an expression. Then evaluate the expression when a=2 and b=7
- 9 minus a
- 9-a
9-2=7
Tell which property is illustrated by the statement.
0 + x = x
Addition Property of Zero
Simplify the expression.
3 ( x - 2 )
3x - 6
Identify the terms, coefficients, constants, and variables in the following expression.
5a + 7
Terms: 5a, 7
Coefficients: 5
Constants: 7
Variables: a
Evaluate the expression when x=6 and y=5
x + y - 4
7
Write the phrase as an expression. Then evaluate the expression when a=2 and b=7
- 9 increased by a number a
- 9 + a
9 + 2 = 11
Tell which property is illustrated by the statement.
3 + z = z + 3
Commutative Property of Addition
Simplify the Expression.
4 + 5 ( x + 3 )
5x + 19
You earn 15n dollars for mowing n lawns. How much do you earn for mowing seven lawns?
$105
Don't forget to label!!!!
Evaluate the expression when x=6 and y=5
2 ( 8 - y )
6
Write the phrase as an expression. Then evaluate the expression when a=2 and b=7
- twice a number b
- 2b
2 x 7 = 14
Tell which property is illustrated by the statement.
( 2 x 5 ) x C = 2 x ( 5 x C )
Associative Property of Multiplication
Simplify the expression.
4 ( 6a + 7 - 2 )
24a + 20
The expression 20a + 13c is the cost (in dollars) for a adults and c children to enter a science camp. Find the total cost for 4 adults and 24 students.
20(4) + 13(24)= 80 + 312= $392
Evaluate the expression when x=6 and y=5
xy
30
Write the phrase as an expression. Then evaluate the expression when a=2 and b=7
- b less than 20
- 20 - b
20 - 7 = 13
Tell which property is illustrated by the statement.
5 ( x - 2 ) = 5x - 10
Distributive Property
Combine like terms and simplify.
6a - 4 + 7a
13a - 4
A race car driver typically drives 3 races on weekdays and 10 races on a weekend day.
a. Write an expression for the total number of races on x weekdays and y weekend days.
b. Use the expression to find the number of races on 4 weekdays and 2 weekend days.
a. 3x + 10y
b. 3(4) + 10(2)= 12 + 20 = 32 races
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Evaluate the expression when x=6 and y=5
( x - 1 ) ( y - 1 )
20
Write the phrase as an expression. Then evaluate the expression when a=2 and b=7
- the product 4 and the difference of 10 and a number b
- 4 (10 - b)
4 (10-7)= 12
Simplify the Expression. Explain each step.
1/3 x q x 3
- (1/3 x 3) x q= 1 x q= q
Commutative Property of Multiplication
and Multiplication Property of One
Combine like terms and simplify.
6a - 2b + 3( a - b )
6a - 2b + 3a - 3b=
9a - 5b
The width of a widescreen TV is 18 inches greater than its height h. Use the distributive property to write and simplify an expression for the area of the TV screen.
Area= length x width
length= height
width= height + 18
h ( h + 18 ) = h2 + 18h