Which expression is equivalent to 21/15 - 915? A. 12 B. 30 15 c. 125 D. 12 15

Mathematics

2 answers:

zepelin [54]1 year ago

6 0

I think the answer would be C because it was the answer i got when i solved it

dedylja [7]1 year ago

4 0

$\textbf{Heya !}$

the denominators are equal, so subtracting these two fractions is a piece of cake:-

$\sf{\cfrac{21}{15}-\cfrac{9}{15}}$

$\sf{\cfrac{21-9}{15}}$

$\sf{\cfrac{12}{15}}$

`hope it's helpful to u ~

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Need Help Badly What is the solution

Kamila [148]

Sqrt(1-3x)=x+3
[sqrt(1-3x)]^2=(x+3)^2
1-3x=(x+3)(x+3)
1-3x=x^2+6x+9
-3x=x^2+6x+8
0=x^2+9x+8

The answers are -1 and -8 BUT, we have to plug them back into the original equation to make sure we don't get a negative under the square root sign.

After doing this, we realize that only -1 works, so the answer is x=-1

Sorry that this took forever to answer. I was thinking of a good way to explain this, and if you need any further explanation, message me:)

Best wishes:)

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2 years ago

Can you please Help me please

vagabundo [1.1K]

I think it is a or b idk

4 0

2 years ago

The diagram below gives the dimensions of a swimming pool. 18 ft , 20ft, 36ft (c) What is the total area of the swimming pool? E

WARRIOR [948]

The picture in the attached figure

Part 1) What is the total area of the swimming pool?

we know that
area of the swimming pool=area rectangle-area semi circle

area rectangle=20*36-----> 720 ft²

area semicircle=pi*r²/2
r=18/2----> 9 ft
area semicircle=pi*9²/2----> 127.17 ft²

area of the swimming pool=720 ft²-127.17 ft²----> 592.83 ft²

the answer Part 1) is
The area of the swimming pool is 592.83 ft²

Part 2) What is the perimeter of the swimming pool?

perimeter of the swimming pool=perimeter of rectangle-18 ft+perimeter semi circle
perimeter of rectangle=2*[20+36]---> 112 ft

perimeter semi circle=2*pi*r/2----> pi*r
r=9 ft
perimeter semi circle=pi*9----> 28.26 ft
so
perimeter of the swimming pool=112 ft-18 ft+28.26 ft----> 122.26 ft

the answer Part 2) is
122.26 ft