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Designing aluminum cans 2012-01-08
swathi pose la question :
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.

Penny Nom lui répond.
A wire spiral 2012-01-07
Pinar pose la question :
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

Penny Nom lui répond.
An equation with fractions 2012-01-06
Balkees pose la question :
3/4(4-8x)=2x-2/3(6-12x)
Penny Nom lui répond.
The height of a tower 2012-01-06
trevor pose la question :
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.
Penny Nom lui répond.
The dimensions of a rectangle 2012-01-06
joseph pose la question :
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.
Penny Nom lui répond.
A straight line distance 2012-01-06
Margaret pose la question :
If you traveled 300 miles east and 275 miles north, how many miles would you save by going in a straight line?
Penny Nom lui répond.
Two shapes 2012-01-06
muhammad pose la question :
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.

Harley Weston lui répond.
75% of 12.5 2012-01-05
Jennifer pose la question :
75% of 12.5

Please explain how you got your answer cause I don't understand how to do this

Penny Nom lui répond.
An arithmetic expression 2012-01-05
Jennifer pose la question :
1.8 + 3.2 / 0.4 - 4.375 x 0.2
Penny Nom lui répond.
Adding fractions 2012-01-05
laurie pose la question :
if shaded parts of a circle are 4/7 and the other is 1/3 what fraction is left
Penny Nom lui répond.
A parabolic arch 2012-01-04
Swathi pose la question :
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

Penny Nom lui répond.
A 46% increase 2012-01-03
kabilan pose la question :
increase a price of £8.24 by 46% and give the answer to the nearest penny
Robert Dawson lui répond.
Lotto tickets 2012-01-03
Ashley pose la question :
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)
Robert Dawson and Penny Nom lui répond.
Mean and Average 2012-01-03
john pose la question :
what is the difference between average and mean
Robert Dawson lui répond.
Triangles, area and perimeter 2012-01-01
Panny pose la question :
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..

Penny Nom lui répond.
 
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