10/14/14

Square Root of a complex number
sqr root (-15+8i)
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10/09/14

Select the x-coordinate of the vertex......
Select the x-coordinate of the vertex of the parabola defined by the function f(x)=-9x^2 +5x+7? a) - 9/5 b) 7 c) 5/18 d) - 5/9
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10/06/14

How do I do a problem that says one number is five less then twice another . If the product of the two numbers is 117 find the numbers
One number is five less than twice another if the product of two numbers is 117 find the numbers
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10/04/14

How fast in inches per minte the water rising the pool?
 10 gallons per minute water flows into a 16 feet circular pool.
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10/02/14

-6x-3=3-6x
What do you do when variables are the same number and if you add to one side, it will make other side 0.
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10/02/14

how do i simplify this?
(3√24)-(3√54)-(2√ 24)
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10/02/14

The hypotenuse of a right triangle is 6 ft long. One leg is 1 foot shorter than the other. Find the lengths of the legs. Round to the nearest tenth of a foot.
The hypotenuse of a right triangle is 6 ft long. One leg is 1 foot shorter than the other. Find the lengths of the legs. Round to the nearest tenth of a foot.
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10/01/14

how to solve this problem using the quadratic formula
x2-x-20=0
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10/01/14

leg of a right triangle is 8 millimeters longer than the shorter leg the hypotenuse is 16 millimeters longer than the shorter leg
one leg of a right triangle is 8 millimeters longer than the shorter leg and the hypotenuse is 16 millimeters longer than the shorter leg. Find the lengths of the sides of the triangle
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09/18/14

How do you integrate 1/(x^2 + 25)^2?
I've been stuck on this question for a while. I've tried integration by parts but that doesn't help so I thought substitution would help but I don't know what to substitute it for.
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09/18/14

Please Solve
1. Each of the following refers to two quantities. Introduce a variable to represent the first of these quantities, and then represent the second quantity in terms of the same variable. A number; ... more
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09/17/14

A hose can fill a swimming pool in 6 hours.
other hose needs 3 more hours to fill the pool than the two hoses combined. How long to fill it with both
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09/15/14

How many green marbles need to be taken out to have a total of 52% green?
Okay, so my question is...If there are 150 marbles total in a bag with 90 of them green and 60 are red, how many green marbles need to be taken out to have 52% of them green?
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09/15/14

my number has a tens digit that is eight more than the ones digit. zero is not one of my digits
My number has tens digit that is eight more than the ones digit.  Zero is not one of my digits
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Expert Answers •1

09/14/14

The product of two numbers is 1. Decide the second factor if the first one is 3/5
There are a total of 4 questions. A) the first factor is 1/4 B)the first factor is 2 C)the first factor is 3/5 D)the first factor is 6   A) 1/4 = 0,25 0,25*4=1   B)... more
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09/08/14

Finite help! Combinatorics: I need help with this question! I've tried it multiple times but I don't think I came up with the right answer
Using digits from this set {1,2,3,4,5,6,7}, how many different 3 digit numbers can be formed if digits cannot be repeated and the 3 digit must be odd?   I came up with 36 as an answer and I don't... more
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09/04/14

Prove.1. (AnB)\(CnD)=(A\C)n(B\D)
2. (A∩B)\C=(A\C)∩(B\C)
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08/21/14

Permutations vs Combinations
You are going to draw 2 cards from a deck of cards (without replacement).  What is the probability you will draw two aces?
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08/21/14

Compounding
Find the percent of growth or decay a. y=3000(1.36)^t b. y=15(.29)^t
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08/21/14

Integrate x/(x^2-5x+25)
When I substitute u=x^2-5x+25 I get du=2x-5 dx. That gets me close to x dx. I would normally just pull out 1/2, but I'm confused how to deal with the -5.  it looks like I should get a ln portion... more
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08/21/14

A lighthouse is 100 meters from a straight shoreline.
a lighthouse is 100 meters from a straight shoreline. the light turns at a rate of 10 revolution per minute (20π radians/minute), and shines a moving spot of light along the shore. How fast is the... more
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08/20/14

The imaginary number i is defined such as i^2=-1. What does i^+ i^2+i^3+...i^23 equal?
I keep getting i^23=i^20+3=i(4x5)+3=-i   It should up -1 but I do not know how
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08/13/14

How do I solve this quadratic equation by factoring..?
Y^2 + 11y = 0
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08/13/14

An investor wants to analyze the earnings of a mutual fund account. 4 years ago the value ofthe account was $22,000
 and it is now worth $27,500 (no additional deposits were made). if the account is compared to a bank account paying interest that is compounded continuously, what interest rate would the bank... more
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08/13/14

Word problem
A farmer had some ducks and cows in the field. He sent his children out to count the number of animals. Jean counted 50 heads. Charles counted 154 legs. How many of each kind were counted?
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