Naz buys a fridge from a shop for £189 the cost of delivery is proportional to the distance from the shop for 15 miles the cost is £9 naz lives 24miles from the shop is the total cost more than £200

What are the solutions to the equation 4x2+3x=24-x

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

What percent of 18 is 24? and plz explain thx.