5x + 15 = 0 ...subtract 15 from both sides (subtraction property of equality)
5x = -15 ...divide both sides by 5 (division property of equality)
x = -15/5
x = -3
Answer:
EVEN NUMBERS can be looked at as any number (call it "n"), multiplied by 2. Therefore, all even numbers can be described as 2n. Two even numbers added together can be written as: 2n + 2m, where n and m are the even numbers in question, divided by two. A simple rearranging of the terms above gives: 2n + 2m = 2(n + m). Therefore, any even number plus any other even number will always equal an even number (as the answer you get will always be some number multiplied by two). An odd number can be looked at as an even number with one added to it - e.g. 5 is 4+1. Therefore, if you add two odd numbers together, what you're really doing is adding an even number to another even number, then adding 1 + 1, which is 2, and therefore even. As shown above, adding three even numbers together will always give an even number. QED.
Answer:
$278.40
Step-by-step explanation:
Note: "...an additional 10% off any shoe item, once the first discount has been applied." (emphasis added).
Note that the customer is buying 3 pairs of shoes for $120 each: 120 x 3 = $360
The first discount is the 20% discount (on every single item), the second discount is the 10% discount coupon of of any item (which signifies one item only).
Solve for the first discount:
$360 x 0.20 = $72
$360 - 72 = $288.
Next, divide $288 by 3 (to get the individual prices of the shoes:
$288/3 = $96.
The customer then uses a birthday coupon for one of the shoes, which gives an additional 10% off.
$96 x 0.10 = 9.6
$96 - 9.6 = $86.4
Remember, the other two shoes still cost $96 each. Add the price together:
$96 + $96 + $86.4 = $278.40
$278.40 will be the total.
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A trapezoid has two parallel side
Your answer is 3.45 x 10^5
