Match the following. variable
term
1. a letter or symbol used to represent an unknown number
one term or multiple terms connected by an addition or
2.
subtraction sign
a number or a variable, or the product of a number and
3.
variable(s)
4. an equation that uses variables to state a rule
expression
constant
5. a number; a term containing no variables
formula

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z

In the diagram below,abc is congruent to dec what is the value of x