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balu736 [363]
3 years ago
13

drew bought a chemistry book for $30. later that book was marked down by 20%. what was the cost of the book with the discount?

Mathematics
1 answer:
drek231 [11]3 years ago
3 0

Answer:

It would be 6 dollars

Step-by-step explanation:

20 percent of 30 dollars is 6 dollars.

If an item costs 30 dollars and it's on sale for 20 percent off, how much will you save? To figure this out, you need to find 20 percent of 30.

This is easy to do in your head. Think of what 10 percent would be. 10 percent of 30 would be the same as .10 x 30, or 3. So, 10 percent off is 3 dollars off.

20 percent is twice as much as 10 percent. If 10 percent off is 3 dollars, then 20 percent off would be 2 x 3 or 6.

20 percent of 30 dollars would be 6 dollars.

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You just need to add all of the numbers, and you will find that there were 200 people accounted for in the chart. 78 of 200 is 39%
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3 years ago
What is the solution to the inequality below?<br> X^2&gt;=81
kotegsom [21]
  • Answer:

<em>A. x ≤ - 9 or x ≥ 9</em>

  • Step-by-step explanation:

<em>x² ≥ 81</em>

<em>| x | ≥ 9</em>

<em>x ≥ 0 => x ≥ 9 => x ∈ [ 9 ; + oo)</em>

<em>x < 0 => x ≤ - 9 => x ∈ ( -oo ; - 9 ]</em>

<em>x ∈  ( -oo ; - 9 ] ∪ [ 9 ; + oo)</em>

7 0
3 years ago
Mrs smith has 5 times as many markers as colored pencils. The total is 54. How many markers does she have?
zhenek [66]
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3 0
3 years ago
A 10 ounce can of peaches cost $2.40 in a 25 ounce can of peaches cost $4.80 what is the unit price of the 25 ounce can of peach
Elina [12.6K]

Unit price = total price / size


unit price for 25 ounce can :


$4.80 / 25 ounces = $0.192 per ounce

7 0
2 years ago
The cloth top of the gazebo in Mr. Chang’s backyard has ripped from weathering. He needs to know the area of the cloth so he can
antoniya [11.8K]

Answer:

<u>The correct answer is A. 60 square feet.</u>

Step-by-step explanation:

1. Let's review the data provided to us for solving the question:

The gazebo in Mr. Chang's backyard, according to the figure, is a square pyramid because its base is a square of 6 feet as length of its sides.

Length of the sides of the base = 6 feet

Slant length = 5 feet

Height = 4 feet

2. How much cloth, in square feet, will Mr. Chang need, assuming he does not need to replace the cloth at the bottom of the figure?

Area of a square pyramid = Base area + 1/2 Perimeter * Slant length

Replacing with the real values, we have:

Area of a square pyramid = 6 * 6 + 1/2 (6 + 6 + 6 + 6) * 5

Area of a square pyramid = 36 + 1/2 (24) * 5

Area of a square pyramid = 36 + 12 * 5

Area of a square pyramid = 36 + 60

Area of a square pyramid = 96 feet ²

3. But remember than Mr. Chang doesn't need to replace the cloth at the bottom of the gazebo.

So we need to subtract the area of the base to the area of the square pyramid:

Area of the square pyramid - area of the base

Area of the base = 6 * 6 = 36 feet ²

96 feet ² - 36 feet ² = 60 feet ²

<u>The correct answer is A. 60 square feet.</u>

7 0
3 years ago
Read 2 more answers
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