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Sloan [31]
3 years ago
8

If you add the year of my birth to this year, subtract the year of my 20th birthday and the year of my 85th birthday, and then a

dd my present age, the result is 49. How old is she?
Mathematics
1 answer:
Bas_tet [7]3 years ago
7 0
It's not possible for the result to be 49
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9 1/6 divided by 5/6
AnnZ [28]

Rewrite 9 1/6 divided by 5/6 as follows:

 55      6

 ---- * -----

   6      5

Reducing this produces the desired quotient, 11.

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What is the answer for Expanding <br> 2t(6t-3)
Jlenok [28]

Answer:

Step-by-step explanation:

12t2 - 6t

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An hourglass consists of two sets of congruent composite figures on either end. Each composite figure is made up of a cone and a
belka [17]
Answer: third option 268.8

Explanation:

For this kind of proble it is very important that you attach the figure because it contains important information to understand the question.

I have attached the figure for better understanding.

1) The top portion (and the bottom is congruent but rotated 180°) of the hourglass is a figure equivalent to a cylinder on top and a cone on bottom.

So the total volume contained in the top portion is the volume of a cylinder + the volume of a cone.

This is how you calculate the volume of the top portion:

1) The height of the cylinder is 54 mm - 18 mm = 36 mm

2) The formula for the volume of a cylinder is V = π (radius)^2 * height

radius = 8 mm
height = 36 mm

=> V = π(8mm)^2 * 36 mm = 2304π (mm)^3

3) The formula for the volume of a cone is V = (1/3)π(radius)^2 * height

radius = 8 mm
height = 18 mm

V = (1/3)π(8mm)^2 * 18 mm = 384π (mm)^3

4) The total volume of the top portion is volumen of the cylindrical part + voume of the cone:

Total voluem = 2304π (mm)^3 + 384π (mm)^3 = 2688π (mm)^3

5) To find the number of seconds <span>it take until all of the sand has dripped to the bottom of the hourglass you have to divide the total volumen of sand by the rate:

time in seconds = total volume of sand / rate of dripping

time in seconds = [2688 π (mm)^3 ] / [10π (mm)^3 / s] = 268.8 s

That is the answer: 268.8 s
</span>

4 0
3 years ago
Read 2 more answers
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andriy [413]

Answer:

y= -\frac{3}{5} x

3 0
3 years ago
Solve for x X/3+2=x/3
Nataly_w [17]

Answer:

no solution

Step-by-step explanation:

X/3+2=x/3

Subtract x/3 from each side

X/3-x/3+2=x/3-x/3

2 = 0

This is never true so there is no solution

8 0
3 years ago
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