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Vesna [10]
3 years ago
5

The square of a number exceeds the number by 72. Find the number

Mathematics
1 answer:
balu736 [363]3 years ago
8 0
X^2 = x + 72 you have a quadratic.
x^2 - x - 72 = 0
(x - 9)*(x + 8) = 0
x = 9 or x = - 8

We have to check this one. One of the answers could be wrong.
9^2 = 9 + 72
81 = 81 This one checks out and is OK.

(-8)^2 = -8 + 72
64 = - 8 + 72 
64 = 64.
Both answers work.
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If one trip around a track is 440 yards , one person runs it in 6 minutes another person runs it in 8. How long will it take for
romanna [79]
6 + 8 = 14
14/2 = 7 minutes to arrive at the starting point together ☺️
I hope that the answer is correct
7 0
3 years ago
Read 2 more answers
If 40 is decreased by 80% what is the new amount
TEA [102]

Answer:

8

Step-by-step explanation:

40*0.80 = 32

40 - 32 = 8

3 0
3 years ago
For what values of x is the rational expression below undefined?
Llana [10]
The value of x that will result for the rational expression to be undefined will be the values that will give 0 value for the denominator.

A. 7 
<span>2(7)^2 -32 = 66
</span>
<span>B. 4 
</span>2(4)^2 -32 = 0 <span>-------> undefined</span>

C. 2
2(2)^2 -32 = -24

<span>D. -2 
</span>2(-2)^2 -32 = -24

<span>E. -4 
</span>2(-4)^2 -32 = 0 -------> undefined

F. -7
2(-7)^2 -32 = 66
7 0
3 years ago
Martin’s neighbors pay him $8 per week to walk their dog. He saves his money for 5 weeks. Martin buys a new bike helmet for $37.
elena55 [62]

Answer:

8*5=40

so 40-37=3

$3left

Step-by-step explanation:

4 0
4 years ago
Read 2 more answers
How to find angles on two Line intersect
Ivan
Hello!

Vertical angles are always congruent

This means that 3x - 35 = 130

We can solve this algebraically

3x - 35 = 130

Add 35 to both sides

3x = 165

Divide both sides by 3

x = 55

The angle AOB and AOC are supplementary which means they add to 180

First we have to find what angle AOB equals

3(55) - 35 = 130

We can subtract 180 by this number to get angle AOC

180 - 130 = 50

Angle AOC is 50

The answers are x = 55 and AOC = 50

Hope this helps!
7 0
4 years ago
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