1. Which is an example of an algebraic expression?
A. 4(3+8)
B. 18^2
C. 3 - *
D. 21 x 4
2. Which is an algebraic expression for 5 more than?
A. 5z
B. z + 5***
C. 5z + 5
D. 5 - z
3. Which word phrase can be used to represent the algebraic expression 4(21 + n)?
A. 4 plus the sum of 21 and a number n
B.4 times the product of 21 and a number n
C.4 times the sum of 21 and a number n ***
D.4 less than the sum of 21 and a number n
4. Which is an algebraic expression for the word phrase "8 less than the product of 12 and a number x"?
A. 12x - 8***
B. 8 - 12x
C. 12 - 8x
D. 8x - 12
Variables and Expressions
C
B
C
A
D
idiocy seems to be dense in this area, however the test answers bobby gave are correct.
Anonymous is correct for those 4 answers although there is 5. Bobby is 100% correct for all 5 answers.
Incase that changes, here are the written answers.
1. 3-a
2. z+5
3. 4 times the sum of 21 and a number n
4.12x - 8
5. 2.5
(Please use this for practice. Take the time to study, it’ll help with exams and finals). Goodluck randoms :)
all correct. go to the head of the class
Thank you
can someone please post the answers for the DVDs and Songs Quiz, I need it fast
2.5r*
1. To identify the algebraic expression, we need to look for an expression that has variables (letters that represent unknown values) and mathematical operations (such as addition, subtraction, multiplication, or division).
A. 4(3+8)
This is an algebraic expression because it includes the variable 4 and the operation of addition.
B. 18^2
This is not an algebraic expression because it does not contain any variables. It is a numeric expression, specifically the square of 18.
C. 3 - *
This is an algebraic expression because it includes the variable "a" and the operation of subtraction.
D. 21 x 4
This is not an algebraic expression because it does not contain any variables. It is a numeric expression, specifically the multiplication of 21 and 4.
Therefore, the algebraic expressions in the given options are:
A. 4(3+8)
C. 3 - *
2. To determine which is an algebraic expression for "5 more than," we need to look for an expression that adds 5 to a variable z.
A. 5z
This expression represents the product of 5 and a variable z, not "5 more than" z.
B. z + 5
This is the correct algebraic expression because it adds 5 to the variable z, representing "5 more than" z.
C. 5z + 5
This expression represents the sum of 5 times z and 5, which does not match "5 more than" z.
D. 5 - z
This expression represents the subtraction of z from 5, which is not "5 more than" z.
Therefore, the correct algebraic expression for "5 more than" is:
B. z + 5
3. To determine the word phrase that represents the algebraic expression 4(21 + n), we need to understand the meaning of the mathematical operations and their order in the expression.
The expression starts with the number 21, then adds the variable n to it, and finally multiplies the sum by 4.
A. 4 plus the sum of 21 and a number n
This does not represent the multiplication of 4 with the sum of 21 and n.
B. 4 times the product of 21 and a number n
This does not represent the sum of 21 and n, which is multiplied by 4.
C. 4 times the sum of 21 and a number n
This represents the correct word phrase as it explains that the expression involves multiplying 4 by the sum of 21 and n.
D. 4 less than the sum of 21 and a number n
This does not represent the multiplication of 4 with the sum of 21 and n.
Therefore, the word phrase that can be used to represent the algebraic expression 4(21 + n) is:
C. 4 times the sum of 21 and a number n
4. To find the algebraic expression for "8 less than the product of 12 and a number x," we need to figure out the mathematical operations involved and their order.
The phrase implies that we first need to find the product of 12 and x and then subtract 8 from it.
A. 12x - 8
This is the correct algebraic expression as it represents the product of 12 and x, with 8 subtracted from it.
B. 8 - 12x
This expression represents the subtraction of 12x from 8, which is the opposite of what the word phrase suggests.
C. 12 - 8x
This expression represents the subtraction of 8x from 12, which is not "8 less than" the product of 12 and x.
D. 8x - 12
This expression represents the subtraction of 12 from 8x, which is not "8 less than" the product of 12 and x.
Therefore, the algebraic expression for the word phrase "8 less than the product of 12 and a number x" is:
A. 12x - 8