1. 1 • 12
numerical expression
variable expression; a is the variable
variable expression; there is no variable
variable expression; l is the variable
2. f ÷ 7
variable expression; there is no variable
numerical expression
variable expression; g is the variable
variable expression; f is the variable
3. Choose the variable expression for 9 more than a number s.
9 – s
s + 9
s + 10
9 ÷ s
4. Which word phrase can be represented by the variable expression b – 6?
the difference of 6 and b
the quotient of a number b and 6
6 more than a number b
6 less than a number b
5. Which word phrase can be represented by the variable expression 2p + 3?
three more than Sam’s age doubled
twice Sam’s age times three
half Sam’s age times three
three times Sam’s age
Anyone?
I'll be glad to check your work.
1. A.
2.c
3.?
4. A
5 D
1. A. - Yes
2.c - No
3.? B
4. A - No
5 D - No
Did you really read all of these problems and answers? One of your answers gives me the idea that you didn't read the problems and answers.
1. A.
2. B?
3. B
4.B
5. A or c
3 is right.
One of your answers for 5 is right.
5. A
5 A is right.
78
1. The first expression, 1 • 12, is a numerical expression. It involves multiplying the numbers 1 and 12.
2. The second expression, f ÷ 7, is a variable expression. It involves dividing a variable f by the number 7.
3. The variable expression for "9 more than a number s" is s + 9. To represent adding 9 to the variable s, we use the expression s + 9.
4. The word phrase that can be represented by the variable expression b – 6 is "6 less than a number b." The expression b – 6 represents subtracting 6 from the variable b.
5. The word phrase that can be represented by the variable expression 2p + 3 is "three more than Sam's age doubled." The expression 2p represents doubling Sam's age (p) and then adding 3 represents three more than that doubled age.