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Xelga [282]
3 years ago
13

The area of a rectangle is 525 sq cm. the ratio of the length to the width is 7:3. find the length and width.

Mathematics
1 answer:
nalin [4]3 years ago
3 0
Suppose the length is 7x, the width is then 3x
7x*3x=525
21x²=525
x²=25
x=5
so the length is 7*5=35, and the width is 3*5=15
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Shawn has $5 more than Rj and Riley has $10 less than Shawn. If there combined total is $414, how much does
ExtremeBDS [4]

Answer:

Rj has 138 dollars, Shawn has 143 dollars, and Riley has 133 dollars.

Step-by-step explanation:

Let's make the amount of money Rj has x, so Shawn would have 5+x dollars, and Riley would have (5+x)-10 dollars. Altogether they have 414 dollars, so you can create an equation.

x+(5+x)+((5+x)-10)=414\\3x+0=414\\3x=414\\x=138

Now that we know that x=138, we can substitute x into each equation.

Rj has 138 dollars, Shawn has 143 dollars, and Riley has 133 dollars.

5 0
2 years ago
Read 2 more answers
Which questions can be answered by finding the surface area? Check all that apply.
True [87]

Answer:

Step-by-step explanation:

Surface area is pretty synonymous with area.

How much paint is needed to paint the outside of a birdhouse?

Paint is measured in volume, so not surface area

How much wallpaper is needed to cover the walls of your room?

Since its just the walls its not total surface area, but surface area of the walls.

How much water will it take to fill a rectangular container?

water is measured in volume, especially when wanting to fill something.

How much topsoil can a gardener place in his wheelbarrow?

Wants to know how much topsoil is needed to FILL the wheelbarrow, filling is volume.  So not surface area.

How much fabric is needed to make a pillowcase for a pillow?

Not asking to fill the pillowcase, just how much is needed for the thin, one layer thick case.  So this is surface area.  

3 0
3 years ago
Can someone help me? It's urgent and thank you!
tino4ka555 [31]

Answer:

480,700

Step-by-step explanation:

C(25,7)

25!/(7!*(25-7)!)

15511210043330985984000000/(6402373705728000*5040)

480700

8 0
2 years ago
Joe is hiking a trail that is 30 miles long. after several days, he is two times as far from the beginning of the trail as he is
lora16 [44]
In order to answer this question let's suppose,
Joe is x miles from the beginning and y miles from the end. These assumptions are necessary to answer further:

Now,
x=2y
x+y=30
plugging in x=2y in the above equation
2y+y=30
3y=30
y=10

Hence, according to our calculations, Joe has to hike 10 miles further
5 0
3 years ago
Rabbit population can double every 30 days, if there are 20 rabbits on a farm, how many rabbits will be on the farm after 210 da
Art [367]

Knowing the amount doubles every 30 days, we'll have to find how many times it'lll double in the 210-day time frame:

210 / 30 = 7


It doubles 7 times. If we were to write a rough, not worked on expresion representing that, knowing the starting population was of 20, we would write:

(((((((20 * 2) * 2) * 2) * 2) * 2) * 2) * 2) = 2560 rabbits




Hope it helped,



Happy homework/ study exam!




7 0
3 years ago
Read 2 more answers
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