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Lapatulllka [165]
3 years ago
7

Which describes the cross section of a cube that passes through the vertices A, B, C, and D shown below?

Mathematics
2 answers:
Y_Kistochka [10]3 years ago
6 0

Answer:

A: a rectangle that is not a square

Step-by-step explanation:

kobusy [5.1K]3 years ago
3 0
The answer is A 

myself 

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What is the value of y? PLEASE EXPLAIN<br> 8.5 = y/3 &lt;------ Fraction
NISA [10]

Answer:

y=25.5

Step-by-step explanation:

To find y, you need to get it by itself. Ask yourself, what is being done to y, then to undo that, do the opposite. For example, if 3 was added to y, you would need to subtract 3 to cancel out the 3. In this case, what is being done to y? It's being divided by 3. So, you multiply by 3 to cancel that out. Whatever you do to one side of an equation, you also have to do to the other. So,

8.5=\frac{y}{3}   Multiply both sides by 3

3(8.5) = 3(\frac{y}{3})  multiply on the left side, and on the right side the 3s cancel out

25.5=y

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2 years ago
The curves r1(t) = 2t, t2, t4 and r2(t) = sin t, sin 5t, 2t intersect at the origin. Find their angle of intersection, θ, correc
masya89 [10]

Answer:

Therefore the angle of intersection is \theta =79.48^\circ

Step-by-step explanation:

Angle at the intersection point of two carve is the angle of the tangents at that point.

Given,

r_1(t)=(2t,t^2,t^4)

and r_2(t)=(sin t , sin5t, 2t)

To find the tangent of a carve , we have to differentiate the carve.

r'_1(t)=(2,2t,4t^3)

The tangent at (0,0,0) is     [ since the intersection point is (0,0,0)]

r'_1(0)=(2,0,0)      [ putting t= 0]

|r'_1(0)|=\sqrt{2^2+0^2+0^2} =2

Again,

r'_2(t)=(cos t ,5 cos5t, 2)

The tangent at (0,0,0) is    

r'_2(0)=(1 ,5, 2)        [ putting t= 0]

|r'_1(0)|=\sqrt{1^2+5^2+2^2} =\sqrt{30}

If θ is angle between tangent, then

cos \theta =\frac{r'_1(0).r'_2(0)}{|r'_1(0)|.|r'_2(0)|}

\Rightarrow cos \theta =\frac{(2,0,0).(1,5,2)}{2.\sqrt{30} }

\Rightarrow cos \theta =\frac{2}{2\sqrt{30} }

\Rightarrow cos \theta =\frac{1}{\sqrt{30} }

\Rightarrow  \theta =cos^{-1}\frac{1}{\sqrt{30} }

\Rightarrow  \theta =79.48^\circ

Therefore the angle of intersection is \theta =79.48^\circ.

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2 years ago
Will mark as brainliest !!!! WICH of the following results from taking the square root of a negative number? A) positive number
Vsevolod [243]

Answer:

i think it is A. i may be wrong though.

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You buy 3.18 pounds of peaches​, 1.45 pounds of apples​, and 2.06 pounds of pears. What is your total​ bill?
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Select ALL the expressions that are equivalent to -4(8x-3)
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