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GarryVolchara [31]
3 years ago
9

You plant a tree that is 42 inches tall. After one year, the tree is 47 inches tall. Which expression describes the percent incr

ease of the tree's height?
Mathematics
2 answers:
horrorfan [7]3 years ago
5 0

Answer:

47−42

42  

× 100

Step-by-step explanation:

This is the right answer 47-42 over 42 times 100

kolezko [41]3 years ago
4 0
Use cross multiplication. 42 inches is your 100%. your fraction would be 42/100
then, to find by what percent it has increased, since 47 is your new height, and you are trying to find the percentage for that, the fraction will be 47/X.

42          47 
-----       -----
100         X

(100 * 47) / 42 = X

100 multiplied by 47, then divided by 42, the result is X

your answer should be 111%. Subtract 100 from 111, to get the increased percent.

Answer: 11%

I did this last year, so it may be a little rusty. If im wrong, hopefully someone will correct me, if not, im pretty sure this looks rights. Your methods may also be different. i use cross mulitplication
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The volume of the rectangular prism is 648 feet. The rectangular base is 6 feet by 9 feet. What is the height of the prism?
IrinaK [193]

Answer:

h=12ft

Step-by-step explanation:

The formula one would use for finding the volume of a rectangular prism is as follows:

  • Volume = length × width × height , V=l*w*h

With this in mind, let's plug in the given variables in the question for this formula.

V=648ft^3

l=6ft

w=9ft

h= ?

  • We don't know the height, but that's just fine. We will plug in all our values and isolate h.

V=lwh\\648ft^3=(6ft)(9ft)h

  • I'm leaving in units just because I want to show that units aren't just for show. They can be used when in doubt of how to go about your math.

648ft^3=(6ft)(9ft)h\\648ft^3=(54ft^2)h\\\frac{648ft^3}{54ft^2}=\frac{(54ft^2)h}{54ft^2}

  • Notice, that the units on the left side cancel out, leaving only the unit ft left next to the solution. In the same way, the units on the right side cancel out too, leaving only h, height.

\frac{648ft^3}{54ft^2}=\frac{(54ft^2)h}{54ft^2}\\12ft=h

If involving units only confuses you, like it does for me, you can remove them like so, you just need to know what units your solution uses instead of being able to come to the proper units by using math.

V=lwh\\648=(6)(9)h\\648=54h\\\frac{648}{54}=\frac{54h}{54}\\12ft=h

5 0
3 years ago
Part 2<br> 5. -0.3 ÷ (-0.27) <br> 6. -5.5 ÷ 0.021 <br> 7. -412 ÷ -334 <br> 8. 7.75 ÷ ( -123)
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Answer:

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Andrew [12]

Answer:

A. 3.7

Step-by-step explanation:

3900/1050  = 3.7

5 0
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cestrela7 [59]
$180


Shelby has $180 dollars


5x10=50


13x10=130


130+50= 180

$180 hope that helped :]

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2 years ago
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