Answer:
110 test
Step-by-step explanation:
Let
x ----> the number of packet of 10 test
y ----> the total cost
we know that
The number of packet of 10 test purchase multiplied by $11 plus the enrollment fee of $30 must be equal to $151
so
The linear equation that represent this scenario is
we have
substitute
Solve for x
subtract 30 both sides
Divide by 11 both sides
The number of packets purchase was 11
To find out the number of test, multiply the number of packets by 10
In the question, the given expression is
And we have to find the equivalent expression to the given expression .
First we remove the parenthesis
Now we combine the like terms, and here like terms are z and z, therefore on combining , we will get
And that's the required equivalent expression .