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Designing aluminum cans |
2012-01-08 |
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From swathi:
A company manufactures aluminum cans. one customer places an order for cans that must be 15 cm high, with a volume of 1200cm cube.
a) use the formula V= pie r squared h to determine the radius that the company should use to manufacture these cans
b) graph the function that corresponds to 0 = pie r squared h minus V to determine the radius.
Answered by Penny Nom. |
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A wire spiral |
2012-01-07 |
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From Pinar:
I am trying to help my daughter with very challenging maths questions which sometimes I get stuck
If someone help me with one of them I would appreciate it.
Jane is making a spiral out of wire. She bends the wire after 1 cm, then bends the wire
after 2cm, then 3cm and continues in this manner. After 4 bends she used 15 cm of wire
For each bend how many cm wire was used? After 6 bends how many cm wire will she have used?
How many bends will she have made if she uses 66 cm of wire?
I would appreciate if somebody would help me with this.
Thank you!
Pinar
Answered by Penny Nom. |
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An equation with fractions |
2012-01-06 |
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From Balkees:
3/4(4-8x)=2x-2/3(6-12x)
Answered by Penny Nom. |
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The height of a tower |
2012-01-06 |
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From trevor:
A tower is on the top of a hill. It is 2,400 feet from an observer to a point directly under the tower and at the same elevation as the observer. The angle of elevation from the observer to the base of the tower is 15 degrees and to the top of the tower 23 degrees. How tall is the tower in feet? Compute your answer within one foot.
Answered by Penny Nom. |
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The dimensions of a rectangle |
2012-01-06 |
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From joseph:
The perimeter of a rectangle is 72 inches. The length of the rectangle
is three more than 2 times the width of the rectangle. What is the
length of the rectangle? Write and solve an equation to determine the
dimension of the rectangle.
Answered by Penny Nom. |
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A straight line distance |
2012-01-06 |
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From Margaret:
If you traveled 300 miles east and 275 miles north, how many miles would you save by going in a straight line?
Answered by Penny Nom. |
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Two shapes |
2012-01-06 |
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From muhammad:
Question from muhammad, a student:
a boy has two pieces of wire each 99cm long .he bends them into the shapes shown below.calculate the radius of each figure,giving each answer to two decimal places.figures are one is semicircle and other on is half of the semicircle.
Answered by Harley Weston. |
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75% of 12.5 |
2012-01-05 |
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From Jennifer:
75% of 12.5
Please explain how you got your answer cause I don't understand how to do this
Answered by Penny Nom. |
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An arithmetic expression |
2012-01-05 |
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From Jennifer:
1.8 + 3.2 / 0.4 - 4.375 x 0.2
Answered by Penny Nom. |
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Adding fractions |
2012-01-05 |
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From laurie:
if shaded parts of a circle are 4/7 and the other is 1/3 what fraction is left
Answered by Penny Nom. |
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A parabolic arch |
2012-01-04 |
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From Swathi:
A plan for an arch in the shape of a parabola is drawn on a grid with a scale of 1m per square.
The base of the arch is located at the points (0,0) and (15,0). The maximum height of the arch
is 18m.
a)Determine the quadratic function that models that arch
b)State the domain and range of the function
Answered by Penny Nom. |
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A 46% increase |
2012-01-03 |
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From kabilan:
increase a price of £8.24 by 46% and give the answer to the nearest penny
Answered by Robert Dawson. |
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Lotto tickets |
2012-01-03 |
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From Ashley:
Hi. I play the lotto a lot, and have yet to win. How many combinations can I make with 6 numbers 1-53? I am trying to come up with a dollar amount so I know how much I would have to spend to guarantee a win. Thank you in advance. (I'm no good at math)
Answered by Robert Dawson and Penny Nom. |
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Mean and Average |
2012-01-03 |
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From john:
what is the difference between average and mean
Answered by Robert Dawson. |
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Triangles, area and perimeter |
2012-01-01 |
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From Panny:
I saw a question asked on your board without an answer.
How do I find the area of a triangle any triangle if I only know the perimeter..
Answered by Penny Nom. |
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