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aliya0001 [1]
3 years ago
12

Help me please ??????

Mathematics
1 answer:
Natasha2012 [34]3 years ago
3 0
I don't know the answer so kk
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The area of a rectangular rug is given by the trinomial r^2-4r-21. What are the possible dimensions of the rug?
maksim [4K]

Answer:

There are two possible values for r (area):  r =-7 or r=3

Step-by-step explanation:

Given the rectangular rug area is:

r^{2} -4r -21  

We have to convert the above equation into factored form.

So two numbers whose product is -21r² and sum is -4r

<=> r^{2} -4r -21  

= r^{2} -7r + 3r -21

= r (r -7) + 3(r -7)

= (r-7)(r+3)

We set  r^{2} -4r -21   = 0

<=> (r-7)(r+3) = 0

<=> (r-7) = 0 or (r+3)  = 0

<=> r =-7 or r=3

So, there are two possible values for r (area):  r =-7 or r=3

5 0
4 years ago
A spherical storage tank has a diameter of 14 ft. How many cubic feet of water will it hold?. ______ cubic ft.
AlladinOne [14]
V<span>=(</span><span>4/</span><span>3)</span><span>πr^</span><span>3
R=radius
Diameter= 2 times R
so,
R=7 ft
plugging the values;
V=(4/3)(3.14)(7)^3
V=1436.02 Cubic feet</span>
3 0
4 years ago
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Write at least three different expressions that are equivalent to 16a-24
Vaselesa [24]
I’m not sure if this is how you do it but:
2(8a - 12)
4(4a - 6)
8(2a - 3)
??
4 0
2 years ago
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What is the traslation rule?
Effectus [21]

Mapping Rule A mapping rule has the following form (x,y) → (x−7,y+5) and tells you that the x and y coordinates are translated to x−7 and y+5. Translation A translation is an example of a transformation that moves each point of a shape the same distance and in the same direction.

7 0
3 years ago
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The inverse of F(x) is a function.
leonid [27]

Answer:

This is true.

Step-by-step explanation:

I hope this helped you! :)

7 0
3 years ago
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