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scZoUnD [109]
3 years ago
5

What am I supposed to do

Mathematics
2 answers:
arsen [322]3 years ago
7 0
Im pretty sure you do 14 x 9 which is 126 then do 126 x 3 which is 378mm is your answer          expression: (14mmx9mm)x3mm    answer: 378mm
hope this helps
masya89 [10]3 years ago
4 0
First focus on the main sides. To find the surface area of one side, you must do LxW (length x width). Which is 9x14. And since there are 2 of these size rectangles, 9x14x12=252 (For the ones on the front and back). Now for the top and bottom, use LxW again, 3x14, and since there are 2 of these size rectangles, 3x14x2=84. Now for the Left and Right sides, 3x9. Once again, there are two of these sizes so 3x9x2=54. Then add all those up, the ANSWER IS 252+84+54= 390
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3 years ago
Suppose that in a normal half hour of practice, a tennis player expends 280 calories of energy.
sertanlavr [38]

Answer:

308 Calories

Step-by-step explanation:

So we start off with 280 as usual, but I will focus on the percent. The given percent is 110% "effort". What we would need to do here is, Firstly, change the percent into a decimal, and this is done by moving the decimal spot of 110%. What I mean is that 110.% and you move that little period over 2 times to the left and also remove the percent as for now because we will not need it. After that you would get 1.10. This is what we will multiply by. So if we did 280x1.10 it equals 308, and that is how I got 308

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Step-by-step explanation:

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