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Snowcat [4.5K]
3 years ago
7

What is the surface area of a rectangular prism with a length of 5 centimeters, a width of 3 centimeters, and a height of 12 cen

timeters?
A) 180 cm2

B) 212 cm2

C)222 cm2

D) 360 cm2
Mathematics
1 answer:
rusak2 [61]3 years ago
6 0
I think it would be c)222 cm^2

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katen-ka-za [31]
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3 years ago
sally has 20 coins in her piggy bank,all dimes and quarters. The total amount of money is $3.05. How many of each coin does she
Dafna11 [192]
Let d = number of dimes, q = number of quarters 

<span>Sally has 20 coins in her piggy bank, so </span>
<span>d + q = 20 </span>

<span>The total amount of money is $3.05. </span>
<span>Use the value of each coin multiplied by its number to get total value </span>
<span>.10d + .25q = 3.05 </span>
<span>multiply everything by 100 to clear the decimal places </span>
<span>10d + 25q = 305 and </span>
<span>d + q = 20 </span>

<span>solve the second equation above in terms of either d or q - lets do d </span>
<span>d = 20 - q </span>
<span>sub that into the first equation </span>
<span>10d + 25q = 305 </span>
<span>10(20 - q) + 25q = 305 </span>
<span>200 - 10q + 25q = 305 </span>
<span>15q = 105 </span>
<span>q = 105/15 = 7 </span>
<span>and from above </span>
<span>d = 20 - q = 20 - 7 = 13 </span>

<span>so, there are 13 dimes and 7 quarters </span>
<span>verify with orig problem </span>
<span>13 + 7 = 20, OK, and $1.30 + $1.75 = $3.05 
</span>
5 0
3 years ago
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Let's first find how many students bring their lunch to school. This is 30% of 300. To find this value, convert the percentage to a fraction (or decimal) and multiply:

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Since 90 students bring their lunch to school, we can say 210 students do not bring their lunch to school. (300 - 90 = 210)

8 0
3 years ago
In this diagram, what is the value of b, correct to the nearest tenth?
lilavasa [31]
We will use the Sine Law:
\frac{sin 54.33}{b}= \frac{sin29.16}{3}   \\  b =  \frac{3sin54.33}{sin29.16}
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