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gregori [183]
4 years ago
9

Which equations are true for x = –2 and x = 2? Check all that apply.

Mathematics
1 answer:
Katyanochek1 [597]4 years ago
3 0

Hi Brainiac


x² - 4 = 0

Add 4 to both sides

x² - 4 + 4 = 0 + 4

x² = 4

Now take the square root

x= +/-√4

x= 2 or x= -2

The answer is A


I hope that's help :)

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A 12-foot ladder leans against the wall; the base of the ladder is 2 feet away from the wall.To the nearest tenth of a foot, how
ludmilkaskok [199]
<h3>The ladder will reach a height of 11.8 feet up the wall</h3>

<em><u>Solution:</u></em>

The ladder, wall and base of the ladder from wall forms a right angled triangle

Length of ladder forms the hypotenuse

Length of ladder = 12 foot

base of the ladder from wall = 2 feet

<em><u>To find: height of wall</u></em>

By pythagoras theorem.

c^2 = a^2+b^2

Where,

"c" is the Length of ladder

"a" is the base of the ladder from wall

"b" is the height of wall

Substituting the values,

12^2 = 2^2+b^2\\\\144 = 4 + b^2\\\\b^2 = 140\\\\b = \pm 11.832 \\\\Ignore\ negative\ value\\\\b \approx 11.8

Thus, the ladder will reach a height of 11.8 feet on wall

4 0
3 years ago
Give that the point (15,-11) is on the graph of a one-to-one function f(x), find a point on the graph of f^{-1}.
zvonat [6]

Given:

The point (15,-11) is on the graph of a one-to-one function f(x).

To find:

The a point on the graph of f^{-1}.

Solution:

We know that, if the points on the graph of a one to one function are given by (x,y), then the points on the graph of its inverse function are given by (y,x).

In the point (15,-11).

x-coordinate = 15

y-coordinate = -11

In the inverse function,

x-coordinate = -11

y-coordinate = 15

Therefore, the required point on the graph of f^{-1} is (-11,15).

5 0
3 years ago
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Wittaler [7]
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4 0
3 years ago
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Mashcka [7]

Answer:

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Step-by-step explanation:

It should be

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then add 8 onto both sides, then you would get 0 on one side, and 11 on the other so you would have

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3.6

5 0
3 years ago
Find the unit rate of speed for 120 miles in 2 hours.
Nat2105 [25]

Answer:

60mph

Step-by-step explanation:

120/2=60 mph

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