Mary has 32 she bought 3 comic books that cost 4 each then she and her friend mowed a neighbor yard and earned 18

Mathematics

2 answers:

Inessa [10]3 years ago

4 0

3x4 = 12
32-12 = 20
20+18 = 38
Answer = 38

kifflom [539]3 years ago

3 0

Answer:

Step-by-step explanation:

32 minus 3x4 which is 12

and you get 20

add 18

and you get 38

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Am I correct ??? I don’t really know

Setler [38]

What you have here is a situation with two similar triangles. The triangle in the lower left is similar to the triangle in the upper right - I've included an image with "cutouts" of those triangles so you can see the similarities. Similar triangles have a very important property: the ratios of their corresponding sides are equivalent. Here, we can set up a ratio between the sides of length 64 and x on the larger triangle, and the corresponding sides of length x and 36 on the smaller triangle. Setting the two equal to each other, we have

$\frac{64}{x}= \frac{x}{36}$

Multiplying both sides of the equation by 36 and x, we get

$64\cdot36=x^2$

finally, we take the square root of both sides of the equation to find x:

$\sqrt{64\cdot36}=x\\
\sqrt{64}\sqrt{36}=x\\
8\cdot6=x\\
48=x$