Answer: There are 48 butterflies altogether.
Step-by-step explanation:
Since we have given that
The ratio of number of pink butterflies to the number of yellow butterflies is 3:5
So,
Let the number of pink butterflies be 3x
Let the number of yellow butterflies be 5x
As we have given that there are 18 pink butterflies,
So,

So, total number of butterflies is given by

Hence, there are 48 butterflies altogether.
Answer:
B. 
Step-by-step explanation:
Simplify the expression. Remember to go by the order of operations, or PEMDAS.
1) First, distribute the numbers outside of the set of parentheses to the terms inside the set of parentheses next to them. Then, simplify the fractions.



2) Finally, combine like terms. (This means to add or subtract constants and to add or subtract terms with the same variables.) You may need to convert terms to the same denominator in order to do so easier. Then, reduce the fraction.

Thus, the answer is
.
Answer & Step-by-step explanation:
1) 4x
2) y-8
3) 6/x
4) 12-y
5) y+9
6) 5^2
7) x^4
8) 9+n
9) 64-y
10) 12/n
11) x^2/7
12) x-8=22
13) 2a-b^2
14) 12-ab
a) C = 40 + 30t
b) 280 = 40 + 30t
30t = 240
t = 8
The plumber worked 8 hours