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aivan3 [116]
3 years ago
11

Kate sold one half of her paintings and purchased 7 more. If Kate has 21 paintings now, how many paintings did she have to begin

with?
Mathematics
1 answer:
Anna11 [10]3 years ago
6 0
(work backwards)
21-7=14 (before purchasing)
14x2=28 (before selling)

Ans: 28
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The base is made up of two triangles and a square, if that makes sense. Finding the area of a triangle is (base x height)/2.  

The base of the tiny triangle is 4 because there is 8 inches extra to the 10 inch square. <u>10 x 4 = 40.</u>

Now we have a 10 by 10 square: <u>10 x 10 = 100. </u>

So, the area of the trapezoid is 140. There are two trapezoids in this prism, so both bases are 280.

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The top is solved by <u>10 x 50 = 500.</u>

The bottom is solved by <u>18 x 50 = 900.</u>

Add them all together: 280 + 1200 + 500 + 900 = 2,880

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Step-by-step explanation:

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