She earns 93.5 in the 17 items.
12a.
35 + 3c = 45 + 2c subtract 35 from both sides
3c = 10 +2c subtract 2c from both sides
c = 10
A 10 minute phone call would cost the same amount of money with both companies.
12b.
It is better to use Company B when you need to make a longer phone call because the cost per minute is less. For example, an hour long phone call with company A would be $2.15 and the same call with company B would be $1.95.
14.
The problem with Delia's work is that she put the x with the flat rate instead of the daily charge. The flat rate will only be charged once while the daily fee should be multiplied and charged for every day, x. The correct equation would have been 365 + 125x = 250 + 175x.
Answer:
50m
Step-by-step explanation:
let the width be x
length=3x
3x+3x+x+x=400
8x=400
x=400÷8
x=50