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The volume of a test tube |
2010-05-20 |
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From Nick:
A maths question. I have a test tube (basically a cylinder but with a rounded
bottom end) and the measurements are: the diameter or width of the tube is
31mm and the total length of the whole tube is 204mm. The question is:
(a) what's the volume of this test tube (rounded to the nearest cubic mm) and
(b) what's the capacity of this test tube (rounded to the nearest mL).
I need to show the full mathematical workings out of the two, not just the
answer. The problem is the circular bottom end of the tube, it isn't flat, that
would make it rather "easy"or straightforward but this is a half-circle
(like all test tubes are)!!
Answered by Penny Nom. |
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Percentage increase |
2010-05-20 |
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From Rebecca:
Question from Rebecca:
In 2008 my land was valued at $84,000. In 2009 my land was re-valued at $235,000.00. What is the
percent increase between the two values? I want to be able to express "the
value was increased by x%."
Answered by Harley Weston. |
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A probability tree |
2010-05-20 |
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From Sandy:
Children’s meals are being prepared for a large gathering. There is an equal number of chicken, hamburger, and fish meals. Each meal comes with a toy: a ball, a parachute toy, or a Frisbee. There are twice as many balls as Frisbees and an equal number of parachutes and Frisbees.
Use a probability tree to show the sample space and determine the probability that a meal consists of chicken or fish and comes with a ball as a toy.
Answered by Penny Nom. |
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(x+1)(x+2)(x+3)/(x+1)(x+2) |
2010-05-19 |
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From Nazrul:
Simplify : (x+1)(x+2)(x+3)/(x+1)(x+2)
Which answer is correct:
(i) x+3
(ii) (x+2)^2(x+3)
Please help me.
Answered by Harley Weston. |
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Find the speed of the current of the river |
2010-05-19 |
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From paul:
a boat travels 100 miles downstream in the same length of time it travels 50 miles upstream. if the boat's speed in still water is 30 mph find the speed of the current of the river?
Answered by Penny Nom. |
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A fact family |
2010-05-19 |
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From PRISCILLA:
ELLIE HAS 12 BOOKS. SHE GIVES AWAY 3 BOOKS. ELLIE HAS _LEFT. _ - _ = _ _- _ = _ _+ = _ _ + _ = _
Answered by Robert Dawson. |
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How far am I from the starting point? |
2010-05-18 |
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From jilayna:
if i walk 5 miles north, 7 miles east, and 3 miles north again.to the nearest tenth of a mile ,how far,in a straight line, am i from my starting point
Answered by Penny Nom. |
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A scale model of a city |
2010-05-18 |
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From Briana:
Well I have to create a three dimensional city for a geometry project and it requires us to use precise scal factor and well we want to build a medium sized city but our teacher said that If we make or buildings to high our houses would look like super small compared to the tall building were trying to figure out if we were to build a medium sized city what scale factor should we use to make the houses big enough to see and design?
Answered by Walter Whiteley and Tyler Wood. |
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A quartic equation |
2010-05-18 |
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From Austin:
Z^4-10z^2=-9
Answered by Penny Nom. |
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How many sq. ft in 2 1/2 ft x 2 1/2 ft? |
2010-05-16 |
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From jim:
how many sq. ft in 2 1/2 ft x 2 1/2 ft
Answered by Penny Nom. |
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A conical pile of gravel |
2010-05-15 |
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From Chuck:
If I have a conical pile of gravel 50 feet across at the base and a height of 65 feet and
the slope of the side is approximately 60 degrees, how do I calculate the cubic yards?
Answered by Robert Dawson. |
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88 litres of oil in a cylinder |
2010-05-15 |
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From fella:
88 litres of oil are poured into a drum 40 cm in diameter. find the depth of the oil in the drum.
Answered by Penny Nom. |
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The value of 1 acre |
2010-05-13 |
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From Rebecca:
If 38,121 sq feet equals $19,846.58 at 75% of its current value, what would the value of 1 acre be at 100% of value?
Answered by Penny Nom. |
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Ratios and proportions with mixed units |
2010-05-13 |
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From Kenneth:
Is it incorrect to have a proportion with numbers containing units that are not the same on both sides of the equal sign?
Here is an example: $0.07/$1.00 = ?/$0.89 is okay, but if I add a different unit (20 ounces) to one side of the equal sign but not the same unit to the other, is the proportion incorrect?
$0.07/$1.00 = ?/$0.89/20 ounces.
In order to determine the missing amount, the calculation becomes ($0.07/$1.00)/$0.89/20 ounces = $?, but is this proportion correct with the units as they are?
Two dollar-units cancel leaving dollar/ounces equals $?/ounces, but is this correct?
Answered by Robert Dawson. |
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The circumference of a circle |
2010-05-12 |
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From Morgan:
find the circumference of a circle with radius 8.
im having trouble i just don't understand. thanks for your help i really do appricate it.
Answered by Penny Nom. |
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