 |
|
|
|
|
|
|
|
|
The height of a parabolic arc |
2015-12-30 |
|
From Tom:
Is there an algebraic means to determine the highest point of a parabolic arc if the base and perimeter are known?
Answered by Penny Nom. |
|
|
|
|
|
|
Number of bricks needed |
2015-12-30 |
|
From trudy:
if I have 250 sq ft of space that I want to fill with bricks that measure 7.5 in by 11.5 in how many bricks do I need to fill the 250 sq ft.
Answered by Penny Nom. |
|
|
|
|
|
|
Book sales |
2015-12-30 |
|
From Sandra:
Your finance text book sold 56,500 copies in its first year. The publishing company expects the sales to grow at a rate of 20.0 percent for the next three years, and by 8.0 percent in the fourth year. Calculate the total number of copies that the publisher expects to sell in year 3 and 4.
Answered by Penny Nom. |
|
|
|
|
|
|
How can he raise his average to 90? |
2015-12-29 |
|
From Raj:
Harris has an 87 in a class where daily works count 20%, quizzes count 20% and tests count 60%.
If there are only two test scores what must the score on his second test to raise his average to 90?
Answered by Penny Nom. |
|
|
|
|
|
|
A relative maximum and a relative minimum |
2015-12-28 |
|
From kemelo:
show for the following function f(x)=x+1/x has its min value greater than its max value
Answered by Penny Nom. |
|
|
|
|
|
|
A circle is inscribed in a hexagon |
2015-12-28 |
|
From Lalitesh:
A circle is inscribed in a regular hexagon ABCDEF
Prove that AB+CD+EF=BC+DE+FA
Answered by Penny Nom. |
|
|
|
|
|
|
A troublesome word problem |
2015-12-28 |
|
From Linda:
James is now 3/5 John's age. Three years ago, he was 1/2 John's age. Three years from now, he will be 2/3 John's age.
How old are they now?
Answered by Penny Nom. |
|
|
|
|
|
|
Constructing simultaneous linear equations |
2015-12-28 |
|
From Deborah:
Linda thinks of a two-digit number. The sum of the digits is 8. If she reverses the digits, the new number is 36 greater than her original number. What was Linda's original number?
Thank you!
Answered by Penny Nom. |
|
|
|
|
|
|
Strings of characters |
2015-12-28 |
|
From Ali:
If I have an app and offer a two, three and four digits name and it can be only number, letters or both?
I want to know how many options will I have for each?
For example
the two digits: aa, 11, a1 or 1a
the three digits: 111, a2a, 222
the four digits: 1111, 2ge3 or 1234
So if I used all the letters and all the numbers but nothing starts with a zero
How can I calculate them separately? Or what's the result for each?
Thank you
Ali
Answered by Penny Nom. |
|
|
|
|
|
|
A diameter of a circle |
2015-12-27 |
|
From sahil:
Find the equation of diameter of circle x2 +y2-6x +2y-8 which passes through the origin.
Answered by Penny Nom. |
|
|
|
|
|
|
Converting a fraction to a percent |
2015-12-22 |
|
From Sharon:
How do you turn a fraction into a percentage? I'm beyond confused with this. Even though I think of myself as a good math student doing 8th grade math at a young age, this just makes me want to scream! I get the way you turn 1/4 into 25%, but when it comes to something like 7/9 = ? I just can't figure out the answer.
Answered by Penny Nom. |
|
|
|
|
|
|
The angles of a triangle |
2015-12-17 |
|
From Faith:
Does the measure of angle determine the length of its side? For example two angles are congruent then the sides are also congruent because from my understanding the angle determine the shape of triangle.
Answered by Penny Nom. |
|
|
|
|
|
|
The perimeter of a 4 acre square |
2015-12-16 |
|
From samantha:
What is the distance in miles or how many laps to make a mile, if one was walking around 4 acres of land which is like a square?
Answered by Penny Nom. |
|
|
|
|
|
|
A bus trip |
2015-12-15 |
|
From Michelle:
I do not know what equation(s) should be used in order to obtain the answer(s) to this word problem.
A bus was rented for a trip, the cost was dived equally amongst the passengers. During the trip, someone mentioned that if there were 9 more passengers, they would have paid each 5$ less. Another mentioned that if there were 6 less passengers, they would have each paid 5$ more. What is the cost of renting the bus and how much must each passenger pay.
Answered by Penny Nom. |
|
|
|
|
|
|
Proof that an erroneous algebraic statement is false |
2015-12-14 |
|
From Berteanu:
I need help with this proposition:
"It exists x a real number that for every y real number 5*x-2*y*y=1
This is false.
Let x be from R.
And I need an y real number that 5*x-2*y*y!=1
Please,could you help me?
Answered by Penny Nom. |
|
|
