 |
|
|
|
|
|
|
|
|
Two spinners |
2018-08-13 |
|
Atina pose la question :
A spinner has four equal sectors and a number is written on each sector; 1, 2, 3 and 4. A two-digit number is formed by spinning two times. The number on the first spinning makes the first digit and the number on the second spinning makes the second digit. For example, 2 on the first spinning and 1 on the second spinning make the number 21.
(a) Give the sample space S for the experiment.
(b) Consider the following events : E = odd number; F = number smaller than 35; G = prime number.
Give the subset of outcomes in S that defines each of the events E, F, and G.
(c) Describe the following events in terms of E, F, and G and find the probabilities for the events.
• getting an even integer less than 35.
• getting an odd number or an prime.
• getting an even number greater than or equal to 35 that is a prime number.
• an odd number smaller than 35 that is not a prime number.
(d) Are E and F mutually exclusive events? Give a reason for your answer.
Penny Nom lui répond. |
|
|
|
|
|
|
A cube in a cylinder |
2018-08-13 |
|
Geli pose la question :
A cylinder with a radius r and height 2r+4 contains a cube with edge length r√2. What fraction of cylinder volume is taken up by the cube
Penny Nom lui répond. |
|
|
|
|
|
|
Amy and Joey on a circular track |
2018-08-13 |
|
Zoe pose la question :
Amy and Joey are situated on a circular track 400 feet around.
Joey starts running at a rate of 10 feet per second.
Amy waits for a full minute, then starts running from the same point (in the same direction) at 12 feet per second.
How many seconds elapse before Amy passes Joey on the track?
Penny Nom lui répond. |
|
|
|
|
|
|
Exponents |
2018-08-13 |
|
Ella pose la question :
What is the radical form of 3xy raised to 5 quantity three- fifths?
Penny Nom lui répond. |
|
|
|
|
|
|
Form a cone from a circle sector |
2018-08-12 |
|
Tinashe pose la question :
A 216 sector of a circle of radius 5cm is bent to form a cone. Find the radius of the base of the cone and its vertical angle.
Penny Nom lui répond. |
|
|
|
|
|
|
5 mm of water over 1 hectare |
2018-08-10 |
|
Joyce pose la question :
Please help me with this question.
How many tonnes of water fell on 1 hectare of land during a rainfall of 5mm?
Penny Nom lui répond. |
|
|
|
|
|
|
Truncated cones |
2018-08-08 |
|
Belgacem pose la question :
Hello, I have a truncated cone: height 500mm , Base radius=147mm and I want to calculate the Top surface radius. How to do that? thank you
Penny Nom lui répond. |
|
|
|
|
|
|
Paving stones area |
2018-08-08 |
|
Declan pose la question :
I am thinking of buying some reclaimed block paving stones. There are 750 pieces in total.
60% are L- 140mm x W -140mm x H-50mm
40% are L-170mm x W-140mm x H-50mm
How much area will this cover?
Penny Nom lui répond. |
|
|
|
|
|
|
The record for a soccer team |
2018-07-20 |
|
Payal pose la question :
A soccer team plays six games in one month. Each game results in a win, loss, or tie.
For this soccer team, how many different sets of results are possible for the six games?
Penny Nom lui répond. |
|
|
|
|
|
|
How many students passed the test? |
2018-07-20 |
|
florian pose la question :
In Mr. Edgecomb's math class, 30 students took an exam on statistics. If the average passing grade was 84, the average failing grade was 60, and the overall average was 80, how many students passed the test?
Penny Nom lui répond. |
|
|
|
|
|
|
Linear feet and cubic feet |
2018-07-16 |
|
Dave pose la question :
How do I convert: 1 foot wide x 15 inches high x 19 inches deep
We are trying to figure out how to convert the linear footage into cubic footage
the above are the figures represent just 1 linear feet of several thousand
Any thing helps,
Thanks in advance
Dave
Penny Nom lui répond. |
|
|
|
|
|
|
A sulphuric acid solution |
2018-07-12 |
|
Tan pose la question :
How much 96% h2so4 to add into sulphuric acid 30% in order to make it to 50% sulphuric acid?
Penny Nom lui répond. |
|
|
|
|
|
|
A circle inscribed in a regular polygon |
2018-07-12 |
|
Naveen pose la question :
The radius of inscribed circle for n sided regular polygon of a side a is?
Please with proof
Penny Nom lui répond. |
|
|
|
|
|
|
The price of a watermelon |
2018-07-07 |
|
errin pose la question :
the price of the watermelon is directly proportional to its weight. If a watermelon that weighs 22 pounds cost $5.40, how much will a 17.5 pound watermelon cost?
Penny Nom lui répond. |
|
|
|
|
|
|
Four odd factors |
2018-07-04 |
|
Manchali pose la question :
Find a number that has 4 factors and all of them are odd numbers.
Penny Nom lui répond. |
|
|
