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enot [183]
3 years ago
8

If Mark 12 times older than his brother and his brother is 7 times younger how old his brother​

Mathematics
1 answer:
krok68 [10]3 years ago
3 0

Answer:

word

Step-by-step explanation:

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At what x-values do the graphs of the functions y=cos 2x and y = cos^2 x-1 intersect over the interval 0 ≤ x ≤ pi. There must be
baherus [9]

Answer:

x=\frac{\pi}{2}  and  x=\frac{3\pi}{2}

Step-by-step explanation:

We need to solve the 2 equations to figure out the x-values (intersecting points).

<em>Note: </em>The identity  cos^{2}x=\frac{1}{2}+\frac{1}{2}cos(2x)

cos(2x)=cos^{2}(x)-1\\cos(2x)=(\frac{1}{2}+\frac{1}{2}cos(2x))-1\\cos(2x)=\frac{1}{2}cos(2x)-\frac{1}{2}\\\frac{1}{2}cos(2x)=-\frac{1}{2}\\cos(2x)=-1\\2x=cos^{-1}(-1)\\2x=\pi, 3\pi\\x=\frac{\pi}{2}, \frac{3\pi}{2}

So they intersect at  x=\frac{\pi}{2}, \frac{3\pi}{2}

4 0
3 years ago
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How do you do this geometry problem
shtirl [24]
W= 79 brooooooooooooooooooo
4 0
3 years ago
A cylinder has a volume of 175 cubic units and a height of 7 units. The diameter of the cylinder is
VashaNatasha [74]
The answer is <span>10 units
</span>
The diameter of the cylinder (d) is the twice of its radius (r): d = 2r

The volume (V) of the cylinder with radius r and height h is:
V = π r² h

We have:
d = 2r
r = ?
h = 7
π = 3.14
V = 175π

175π = π * r² * 7
175 = r² * 7
r² = 175/7
r² = 25
r = √25
r = 5


d = 2r
d = 2 * 5
d = 10
3 0
3 years ago
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n the diagram, ABC and DBE are similar. What is the scale factor of the dilation that will map the preimage ΔABC onto the image
ZanzabumX [31]

I am not sure but I do know that you need to have coordinates points in order to be able to graph... so there for you have to make an x/y chart in order to know here to graph...


7 0
3 years ago
What is the value of 3 + (-1/4)² ÷ 1/2?<br><br> A. 6 1/8<br> B. 21 1/8<br> C. 7<br> D. 3 1/8
Amiraneli [1.4K]
<span>3 + (-1/4)² ÷ 1/2
= </span><span>3 + 1/16 * 2
= 3 + 1/8
= 3 1/8

answer

</span><span>D. 3 1/8</span>
6 0
3 years ago
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