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Alex17521 [72]
3 years ago
15

Brian and Heidi went shopping at the mall. Brian spent 30% of the money he had on video games. Heidi spent 25% of her money on c

lothes. If Brian had $140 and Heidi had $180, who spent more money? Explain how you know.
Mathematics
2 answers:
andre [41]3 years ago
8 0
Heidi... if you use a proportion you can find this answer
Lunna [17]3 years ago
7 0
Brain :110

Heidi :155

Brian spent more he spent 30% and Heidi spent 25%

                         Brain
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Answer:

Step-by-step explanation:

Surface area is finding the area of each face and adding them up.  So a cube will have 6 faces, each of them a square.  So find the area of one face and you can just add it 6 times.  If the faces are not all the same you have to find them seperately.  I won't do all of your questions, but let me know if you need help with a specific one

1) there are two trianglular faces and three rectangular ones.  The triangles are the same so let's do those.  They have the base and height of 4 and 3, so area of both will be .5*4*3 = 6, so together that makes 12.  now the three rectangular sides.  Right away you can see there is a 3 by 10 one and a 4 by 10 one.  These ahve areas of 30 and 40 respectfully.  The final face has one length of 10 but the last one is actually the last side of the right triangle faces.  Use the Pythagorean theorem to find it, it word out to be 5.  So now we know the last face is 10 by 5 which means an area of 50.  So let's add them all together.  5 faces total with areas of 30, 40, 50, 6 and 6.  Adding them together makes 136.

If you don't get how I did any of that let me know.  In general it's a good idea to mark every face and then find what their sides are.  I'd be happy to help with specific problems.

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Answer:

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