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In the equation above, if a, b, and c are all constants, what is c?
When x = 12, a certain polynomial, y, equals 0. Which of the following must be true about the polynomial y?
SAT Math 1.5 Algebra and Functions. If f (x) = x2 - 16 and g(x) = x4 - 256, what is f of x divided by g of x?
SAT Math 5.4 Numbers and Operations 210 Views
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SAT Math 5.4 Numbers and Operations
Transcript
- 00:02
Here’s your shmoop du jour, brought to you by Sweaters.
- 00:06
A word of warning: don’t ever wear them while herding sheep.
- 00:12
A sweater is on sale for 25% off the original price. Beth has a coupon for an additional
- 00:17
10% off the sale price. What is the total discount (as a percent)?
- 00:23
Okay, so even though this problem doesn’t give us the original price of the sweater,
Full Transcript
- 00:27
we have enough information to find the answer.
- 00:29
25% off means that Beth is paying 75% of the original price.
- 00:35
10% off the sale price means that Beth is paying 90% of that 75% of the original price.
- 00:42
All we have to do is multiply the decimal forms of those percents.
- 00:46
And we get 0.9 times 0.75 is 0.675. Or 67.5% of the original price.
- 00:54
The original price is 100%.
- 00:57
So we can subtract 100% by the percentage Beth is actually paying 67.5%...
- 01:02
to get the percent discount.
- 01:04
Got that? 100% - 67.5% equals 32.5%...
- 01:10
So the percent discount is 32.5% and we're done.
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