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2 years ago

Pre-algebra Volumes. GIVING BRAINLEST! TO FIRST ANSWER. 25 POINTS!

Mathematics

1 answer:

Anettt [7]2 years ago

8 0

Answer:

Choice B and Choice C

Step-by-step explanation:

Hello! This is how I solved this question:

(10 x 8 x 2) + (3 x 3 x 4) = 160 + 36 = 196ft^3

(10 x 3 x 2) + (5 x 4 x 2) = 60 + 40 = 100ft^3

(8 x 4 x 2) + (3 x 6 x 2) = 64 + 36 = 100ft^3

(8 x 10 x 3) + (4 x 5 x 2) = 240 + 40 = 280ft^3

Choice B and Choice C are the same values, and knowing that you need two of the same values for the volume of the figure must be the same. Giving you your two answers from simply multiplying and adding the answers.

Hope this helps, don't hesitate to ask if you have additional inquiries!

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An educator wanted to look at the study habits of university students. As part of the research, data was collected for three var

MatroZZZ [7]

Answer:

option A

Step-by-step explanation:

Since All values in confidence interval are less than 3.12, we do not have sufficient evidence

as degree of freedom is sample size -1 ; hence df =20-1 =19

In construction of the confidence interval, a t-value with 19 degrees of freedom was used therefore option b, c and d are incorrect

also, In construction of the confidence interval, a z-value with 10 degrees of freedom was used

8 0

3 years ago

Read 2 more answers

Given sin(−θ)=1/5 and tanθ=√6/12 .

Natasha_Volkova [10]

Answer:

B). −2√6/5

Step-by-step explanation:

tan theta = sin theta/ cos theta

Multiply each side by cos theta

tan theta * cos theta = sin theta

Divide each side by tan theta

cos theta = sin theta/ tan theta

We know that the sin (- theta) = - sin theta since sin is and odd function

sin theta = - ( sin (-theta))

Putting this into the above equation,

cos theta = - ( sin (-theta)) / tan theta

cos theta = - 1/5 / (sqrt(6)/12)

Remember when dividing fractions, we use copy dot flip

cos theta = -1/5 * 12/ sqrt(6)

cos theta = -12/ (5 sqrt(6))

We cannot leave a sqrt in the denominator, so multiply the top and bottom by sqrt(6)/sqrt(6)

cos theta = -12/ (5 sqrt(6)) * sqrt(6)/sqrt(6)

cos theta = -12 sqrt(6) / 5*6

Simplify the fraction.

cos theta = -2 sqrt(60/5

3 0

3 years ago

I need help on this.

juin [17]

Answer:

Step-by-step explanation:

All the triangles are similar, so ...

... 3/y = y/27 . . . . . ratio of short side to long side

... 81 = y² . . . . . . . . multiply by 27y

... 9 = y

The Pythagorean theorem tells you ...

... z² = 3² + 9² = 9 +81

... z² = 90 = 9·10

... z = √(9·10) = 3√10

Green Box: 3

4 0

3 years ago

What is the length of the line?

g100num [7]

Answer: 5

Step-by-step explanation:

8 0

3 years ago

Solve for x: 4 over x plus 4 over quantity x squared minus 9 equals 3 over quantity x minus 3

dezoksy [38]

Answer:

Step-by-step explanation:

4/x + 4/(x²-9) = 3/(x - 3)

4 / x + 4 / [( x - 3) ( x + 3 )] = 3 / ( x - 3 ) / * x ( x - 3 ) ( x + 3 )

Restrictions : x ≠ 0, x ≠ - 3 , x ≠ 3;

4 ( x + 3 ) ( x - 3 ) + 4 x = 3 x ( x + 3 )

4 ( x² - 9 ) + 4 x = 3 x² + 9 x

4 x² - 36 + 4 x - 3 x² - 9 x = 0

x² - 5 x - 36 = 0

x² - 9 x + 4 x - 36 = 0

x ( x - 9 ) + 4 ( x - 9 ) = 0

( x - 9 ) ( x + 4 ) = 0

x - 9 = 0, or : x + 4 = 0

Answer:

x = 9, x = - 4

4 0

4 years ago