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larisa [96]
3 years ago
14

Tell weather the two rates form a proportion. help

Mathematics
1 answer:
Sindrei [870]3 years ago
6 0
7/9 = 42/54...when 42/54 reduces, it becomes 7/9...so this is proportional because proportions are nothing but equivalent fractions.

u could also check it this way...
12/21 = 15/24
cross multiply
(21)(15) = (12)(24)
315 = 288.....these do not equal and are therefore, not proportionate

440/4 = 300/3
110 = 100....not equal, so not proportionate

120/5 = 88/4
24 = 22.....not proportionate

66/82 = 99/123
0.804 = 0.804.......these are proportional

68/172 = 43/123
0.395 = 0.349......nope, not proportional




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Determine whether the value is from a discrete or continuous data set. Number of coins in a jar is 78 number of coins in a jar i
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3 years ago
Luis wants to buy a skateboard that usually sells for $135. At big AL's they are discounted 20%. What is the total cost of the s
tino4ka555 [31]

Answer:

117.99

Step-by-step explanation:

First step is to find the discount

Discount = original price * discount rate

               = 135 * 20%

                = 135*.20

                 =27

Take the discount from the original price and that is the new price

new price = original price - discount

                 = 135-27

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Now we need to find the tax

tax = new price * tax rate

       = 108 * 9.25%

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The final price is the new price plus the tax

final price = new price + tax

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