Help Me Please! A repairman charges an inspection fee plus $20 per hour. A customer
with a coupon for 40% off the inspection fee pays $110 for a 4-hour repair.
How many hours are worked when a customer pays $90 without a coupon?

In problems like this, especially if on a timed test, you want to zero in on the answer being sought.  Here it's the number of repair hours when there's no discount on the inspection fee.  So the basic math sentence is:    

Fee plus (X repair hours times $22 an hour) equals $126.    

If we knew the fee, we could solve for X.  The beginning of the problem provides the way,  It gives an example of $124 spent for 4 repair hours when 40 percent of the fee was not charged.  If we think of the total fee as 100 percent, then 60 percent of this fee was charged.  So our equation is  

.6f + 4(22) = 124 or .6f = 124 - 88  = 36 or fee = $60    

Back to our first equation, which becomes:  

60 + 22X = 126 or 22X = 66 or X = 3 hours

can you me as brainliest if its right? i just need a few more to rank up! ^-^ Also have a great day and good luck in your studies!

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%