Please help! I’ll mark your brainliest! 12. A tour bus can seat 55 passengers. A minimum of 15 people must register for the tour to book
the bus.
13. A barn swallow flies 11 meters per second. How fast is this in miles per hour? Note: 1 mile is
approximately 1.6 kilometers.
a. 25 miles per hour
b. 12 miles per hour
c. 5 miles per hour
d. 63 miles per hour
14. Mina bought a plane ticket to New York City and used a coupon for 15% off the ticket price. The
total cost of her ticket, with the discount, was $253.30. What equation could she use to find the
price of the ticket without the discount?
a. 0.15x = 253.30
b. x -0.15(x) = 253.30 C. X = 253.30 +0.15
d. x + 0.15(x) = 253.30

step-by-step explanation:

30% of $420 is 0.30($420) = $126 and $420 + $126 = $546.

or, 130% of $420 is 1.3($420) = $546.

notice that this is not the $600 original list price with which we started.

why doesn't this work?

the method does not work because 30% of $420 is not the same amount as the 30% of $600. it may seem obvious when stated this way, but it is a very common error made on problems of this type. we cannot just use the same percent and get back to the original amount because we are taking that percent of a different value.

to work problems of this type correctly, it is generally best to write an equation for the situation and then solve.

example: since (100% – 30%)(original price) = (sale price)

70% of the   (original price) is $420.

0.7x   = 420

equation image indicator

x = 600

the original cost was $600.

we may also solve this problem using the two-step method. working the problem in two steps requires us to use more algebra skills. we have to know that x = 1x (identity property of multiplicationtext annotation indicator) and that 1x – 0.3x = 0.7x (subtracting like terms). then we solve the problem as follows:

(original price) – 30%(original price) = sale price

x – 0.3x = 420

0.7x = $420

equation image indicator

x = 600

the original cost was $600.  

note that with both of the above methods we do obtain the correct original amount.

example: after a 5% pay raise, hermione is earning $22,680 per year. what was she earning before the pay raise?

105% of (original salary) = current salary

1.05x = 22,680

equation image indicator

x = 21,600

hermione earned $21,600 per year before the pay raise.

this is an example so maybe you will get how to at least do it!

-2 is the right

1.3 million hoops i believe