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A 23 acre airport runway |
2012-02-21 |
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From Ron:
I have a 23 acre plot. If it were in a straight line, would it be enough distance for a plane to take off and land if the plane needed 1 mile?
Answered by Robert Dawson and Penny Nom. |
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The 10000th day of her life |
2012-02-21 |
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From derrick:
Ella was born early in the morning on a Friday.She got married on the 10000th day of her life. What day of the week was it?
Answered by Penny Nom. |
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Tim sells 6 times as many oranges as apples |
2012-02-20 |
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From Bronwen:
Tim sells 6 times as many oranges as apples. If he sell 490 in total one morning, how many of each type were sold?
Answered by Penny Nom. |
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A circle inscribed in a quarter circle |
2012-02-20 |
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From sonam:
ABC is a quarter circle and a circle is inscribed in it and if AB=1cm than find radius of a small circle.
Answered by Penny Nom. |
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Demarkus is paving a new driveway |
2012-02-19 |
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From Anita:
Demarkus is paving a new driveway for a local YMCA volunteer club. The driveway is 90 yards long and 6 yards wide. If the concrete cost $2.50 per square foot, how much will it cost Demarkus to cover the driveway?
Answered by Penny Nom. |
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If x ix directly proportional to y then ... |
2012-02-19 |
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From Crystal:
I understand that we say x and y are proportional, then y = kx.
Generally when we say x is proportional to y, we think that when x increases y increases.
Now I am questioning whether that is actually true.
If k is negative, then when x increases, y DECREASES.
My question is does this mean this statement is incorrect:
If x is proportional to y, when x increases, y increases proportionally.
Is it more correct to say:
If x is proportional to y, when x increases, y either increases proportionally or decreases proportionally.
Along the same line of reasoning, when x is inversely proportional to y,
we think that when x increases y decreases, but that is true only if k is positive.
Is that correct?
Answered by Harley Weston. |
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The (i, j) entry of a matrix |
2012-02-17 |
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From Bilyaminu:
Question Bilyaminu
Find a formula for the (i,j) entry of a matrices: A= [1 2 3 4; 5 6 7 8; 9 10 11 12; 13 14 15 16]
Answered by Harley Weston. |
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240 acres |
2012-02-17 |
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From jon:
How many linear feet are in a 240 acre rectangle piece of property
Answered by Harley Weston. |
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Fractions and proportions |
2012-02-16 |
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From Kenneth:
Hello:
I read the following in an old textbook:
Display the numbers 27, 18, 26, and 39 so as to form a proportion.
Which set of equal fractions is correct?
18/27 = 26/39
18/26 = 27/39
I thank you for your reply.
Answered by Penny Nom. |
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Margie threw a ball |
2012-02-16 |
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From mary:
at 9:45 Margie threw a ball upwards while standing on a platform 35ft above the ground. The height after t seconds follows the equation:
h(t)= -0.6t^2 +72t+35
a) what will be the maximum height of the ball?
b)how long will it take the ball reach its maximum height??
Answered by Harley Weston. |
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Figures with dots |
2012-02-15 |
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From A:
Okay so my daughter came home and had this question for homework from her teacher. I have no idea what it means HELP!!
The question shows a figure that is a square. It has 5 dots on the top, bottom and on the sides looks similar to this:
. . . . .
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they want to know 3 more ways to show the number of dots in the figure. They have already shown one with just counting them
and the other one that they showed was circling the four corner dots and then taking the dots in between with a number sentence set up
like this: 4+4*(5-2) = 4+4*3= 16. They also besides giving 3 ways want us to write a number sentence and an algebraic sentence to show the number of
dots in the figure with "n" sides. Please help! So confusing ! I don't know if my square turned out or not but it should be 5 across the top and bottom and
on the sides and no dots in teh middle it is just the outside.
Answered by Penny Nom. |
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A word problem |
2012-02-15 |
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From Bo:
Jane guessed a number. Tom guessed a number that was double the sum of 1 more than twice the number guessed by Jane. Sum of the numbers guessed by both were 27, what are the numbers?
Answered by Penny Nom. |
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36 golfers |
2012-02-15 |
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From Steve:
We will have 36 golfers playing 4 rounds of golf and would like to have different foursomes each round. In other words, no player will play with another more than once.
Answered by Harley Weston. |
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A cylindrical container |
2012-02-14 |
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From KRIS:
YOU ARE PaCKAGING 4 EQUAL SIZED PAINT CANS WITH A RADIUS 8CM AND A HEIGHT OF 20CM, IN A CIRCULAR CONTAINER.What is the surface area of the packing container?
Answered by Penny Nom. |
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Jack and Kate set off in their cars ... |
2012-02-13 |
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From akiri:
Jack and Kate set off in their cars from the same point to travel the same journey. Jack has a start of eight minutes before Katie sets off. If Jack travels at 50mph and Katie travels at 75mph, how many miles will be travelled when the two cars are level?
Answered by Penny Nom. |
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