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Marina86 [1]
3 years ago
12

Not sure how to answer question 4

Mathematics
2 answers:
laiz [17]3 years ago
8 0
D = 86
Because its the nearest degree to 90 as you see < BAC seems to be 90
drek231 [11]3 years ago
5 0

Answer:

<em>Option D is correct</em>

Step-by-step explanation:

Applying the cosine theorem for triangle ABC, you would have:

cos (angle BAC) = (BA^2 + CA^2 - BC^2)/(2*BA*CA)

                           = (10^2 + 18^2 - 20^2)/(2*10*18)

                           = 24/360

=> angle BAC = ~86 deg

Hope this helps!

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PLEASE HELP:
puteri [66]
3x^2 + 11x - 4 = 0

x^2 + (11/3)x = 4/3

(x+11/6)^2 = 169/36

Answer is B.

8 0
3 years ago
Read 2 more answers
The volumes of two spheres are in a ratio of 1:8 what is the eatio rafi
Agata [3.3K]
Remark
I take it that you want to know the ratio of the radii. If this is not correct, leave a comment below my answer.

You could do this by giving the spheres a definite volume, like 1 and 8 and then solve for r for one of them and then use the other sphere to find it's radius. It is not exactly the best way, and if you are going to to a physics class you want to be doing this using cancellation. 

Step One 
Set up the Ratio for the volumes.

\frac{V_1}{V_2} =  \frac{1}{8}

Step Two
Setup the equation for V1/V2 using the definition for a sphere. V = 4/3 pi r^3

\dfrac{1}{8} =  \frac{ \frac{4}{3} \pi( r_1)^3 }{ \frac{4}{3} \pi( r_2)^3 }

Step Three
Cancel the 4/3 and pi on the top and bottom of the fractions on the right.

You are left with 1/8 = (r1)^3/ (r2)^3

Step Four
Take the cube root of both sides.
cube root 1/8 = 1/2

Cube root of (r1)^3 = r1
Cube root of (r2)^3 = r2

Step  Five
Answer
\frac{r_1}{r_2} =  \frac{1}{2}   Answer <<<<<<<
8 0
3 years ago
What is the volume of the square pyramid shown below?
NemiM [27]

Answer: C) 147cm^{3}

Step-by-step explanation:

First we need to calculate the area of the square base.

This is 7*7 which equals 49 cm squared.

Plug this value into the formula of a square pyramid which will be V = 49 * \frac{h}{3}, now plug in the h, which is 9 cm.

V = 49 * \frac{9}{3}

Now solve.

V = 147 cubic cm.

4 0
3 years ago
<img src="https://tex.z-dn.net/?f=%5Cfrac%7By%5E2%7D%7B36%7D%20-1" id="TexFormula1" title="\frac{y^2}{36} -1" alt="\frac{y^2}{36
liraira [26]

Answer:

that's my answer

Step-by-step explanation:

i hope it helps

5 0
2 years ago
PLEASE HELP! FINDING THE AREA OF THIS RHOMBUS
AlexFokin [52]
Hi there you look very cute in that picture
4 0
3 years ago
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