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3 years ago

I need the answer and explanation pls

Mathematics

2 answers:

Svetach [21]3 years ago

5 0

Answer:

67°

Step-by-step explanation:

A right angle = 90°

90° - 23° = x° = 67°

wolverine [178]3 years ago

3 0

Answer:

Step-by-step explanation:

You can see that there is a square in the corner, that means this is a 90 degree angle.

So just subtract 90 to 23 and you'll get 67.

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Tim installs 50 square feet of his floor in 45 minutes. At this rate how long does it take him to install 495 square feet.

Nina [5.8K]

50 sqft = 45 min
495 sqft = x min

495/50 is 9.9. So we know we multiplied 50 by 9.9 to change it to 495.
Do the same on the other side. 45 x 9.9 = 445.5.

It will take him 445.5 minutes, or 7.425 hours

7 0

3 years ago

Factorise<br> x^2 – 8x - 48

Nitella [24]

Answer:

Factor x^2−8x−48 using the AC method.

(x−2) (x+4)

4 0

3 years ago

Read 2 more answers

What is 4 1/3 times 18

kaheart [24]

Change 4 1/3 to improper fraction: 13/3

13/3 * 18/1 = 234/3

234/3 = 78.

Hope this helped☺☺♥♥

5 0

3 years ago

Read 2 more answers

QUICK PLEASE ANSWER

Mila [183]

Answer:

63/80 and 7/4 * 9/20

Step-by-step explanation:

7/8 * 9/10 = 63/80

7/4 * 9/20

8 0

2 years ago

PLEASE HELP ASAP

Crank

Option D: $f(x)=-2(x+2)(x-4)$ is the function

Explanation:

Let the general form of quadratic equation be $y=a x^{2}+b x+c$

The function passes through the intercepts $(-2,0)$ and $(4,0)$ and also passes though the point $(-1,10)$

Substituting the points $(-2,0)$ , $(4,0)$ and $(-1,10)$ in the equation $y=a x^{2}+b x+c$ , we get,

$4a -2b+c=0$ -----------(1)

$16a +4b+c=0$ ----------(2)

$a-b+c=10$ -----------(3)

Subtracting (1) and (2), we get,

$\ \ 4a -2b+c=0\\ 16a +4b+c=0\\\---------\\ \ \ -12a-6b=0$ -----------(4)

Subtracting (2) and (3), we get,

$16a +4b+c=0\\\ \ a \ \ - \ \ b \ +c=10\\---------\\15a+5b=-10$ ------------(5)

Multiplying equation (4) by 5 and equation (5) by 4, to cancel the term b when adding, we get,

$-60a-30b=0\\\ 90a+30b=-60\\--------\\30a=-60\\\ \ a=-2$

Thus, the value of a is $a=-2$

Substituting $a=-2$ in equation (4), we get,

$\begin{aligned}-12 a+6 b &=0 \\-12(-2)-6 b &=0 \\ 24-6 b &=0 \\ 24 &=6 b \\ 4 &=b \end{aligned}$

Thus, the value of b is $b=4$

Now, substituting the value of a and b in equation (1), we have,

$\begin{aligned} 4 a-2 b+c &=0 \\ 4(-2)-2(4)+c &=0 \\-8-8+c &=0 \\ c &=16 \end{aligned}$

Thus, the value of c is $c=16$

Now, substituting the value of a,b and c in the general formula $y=a x^{2}+b x+c$ , we get,

$y=-2x^{2} +4x+16$

Taking out the common term as -2 we get,

$y=-2(x^{2} -2x-8)$

Factoring , we get,

$y=-2(x+2)(x-4)$

Thus, the function is $f(x)=-2(x+2)(x-4)$

7 0

3 years ago