1. what is varieble?
A.any letter or symbol that represents a number
B.any number or symbol that represents a letter
C.any expressions that comines numbers
D.a fixed value that does not change
2. a mathematical phrase that uses variables, numerals, and operation symbol is called
A. numerical expression
b. constant
c. variable
d. algebraic expression
3. a mathematical sentence with an equal sign is called
a. numerical expression
b. variable
c. algebraic expression
d. equation
4. translate this phrase into an algebraic expression
if nine is added to the difference of a number and nineteen, the sum is ninety
a. b-19+9=90
b. b+19-9=90
c. b divide 19+9=90
d.b times 19+9=90
5. translate this phrase into an algebraic expression
m increased by 3
a. m + 3
b. m +3
c. m - 3
d. m times 3