Answer: £30.31
Explanation:
100/140 minutes of calls were free. Then, 40 x .09, which is 3.6
61 non-free texts, costing 11p each. So... 61 x .11 = 6.71
Add those together, with 20.
Answer:
$5.10
Step-by-step explanation:
We need to find 20% of 25.50
Multiply 20% * 25.50
Change to a decimal
.20 *25.50
5.10
Let x = number of problems on test
If he got 14 wrong, then x - 14 is the number correct.

x - 14 = .72x
.28x - 14 = 0
.28x = 14
x = 50
The test consisted of 50 problems.
Answer:
f(x)=
Step-by-step explanation: