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Kipish [7]
3 years ago
9

Need help please answering this problem!!

Mathematics
1 answer:
Paul [167]3 years ago
7 0
NR = NS + SR = 18 + 45 = 63 m

If NPS~NQR then we can find QR:
\frac{PS}{QR}= \frac{NS}{NR} \ \to \    \frac{7.2}{QR}= \frac{18}{63} \ \to \    \\ QR= \frac{63*7.2}{18}= 25.2 \ m

\text{Area}_{PQRS} = \text{Area}_{NQR}-\text{Area}_{NPS}    \\  \\ \text{Area}_{NQR}= \frac{NR*QR}{2} = \frac{63*25.2}{2}= 793.8 \ m^2 \\  \\ \text{Area}_{NPS}= \frac{NS*PS}{2} = \frac{18*7.2}{2}= 64.8 \ m^2  \\  \\ \text{Area}_{PQRS} =793.8 - 64.8 = 729 \ m^2

Answer: C.
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It is 19%!! :) an explanation is:
We assume, that the number 2500 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 100% equals 2500, so we can write it down as 100%=2500.
4. We know, that x% equals 475 of the output value, so we can write it down as x%=475.
5. Now we have two simple equations:
1) 100%=2500
2) x%=475
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
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6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 475 is what percent of 2500

100%/x%=2500/475
(100/x)*x=(2500/475)*x - we multiply both sides of the equation by x
100=5.2631578947368*x - we divide both sides of the equation by (5.2631578947368) to get x
100/5.2631578947368=x
19=x
x=19

now we have:
475 is 19% of 2500
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The average time Janette took to fold and put away all 4 items is 25.35 seconds.
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