# Posts by coried

Total # Posts: 17

**College Algebra**

Solve the system of equations using matrices. If system has no solution say its inconsistent. 6x + y = 5 3x - y + z - w = 8 z + w = 2 Solve the system of equations using Cramers Rule if applicable. 4x + 2y = 8/5 5x - 5y = 5

*September 13, 2009*

**Algebra**

The function f is one to one. Find its inverse. f(x) = 8x^2 - 9, x>=0

*August 26, 2009*

**Word Problem**

The surface area of a balloon is given by S(r) = 4(pie)r^2, where r is the radius of the balloon. If the radius is increasing with time t, as the balloon is being blown up, according to the formula r(t)=4/5t^3,t>=0, find the surface area S as a function of the time t.

*August 26, 2009*

**College Algebra**

typo those answers contain L's not I's

*August 26, 2009*

**College Algebra**

Solve the equation. e^5x = 2 a. 2/5 e b. in2/5 c. 5 in 2 d. in5/2

*August 26, 2009*

**College Algebra**

The function f is one to one. Find its inverse. f(x) = 8x^2 - 9, x>=0

*August 26, 2009*

**Algebra**

What is the domain of the function f(x)=sqrt(x^4-16)? In interval notation. Please show me how to work this problem out. I cannot find any examples in my book. Thanks!

*August 18, 2009*

**Algebra**

When making a phone call using calling card a call lasting 3 minutes costs $1.60. A call lasting 10 minutes costs $4.40. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that relates to the cost of making the call y, to the ...

*August 11, 2009*

**Algebra**

find the center (h,k) and radius r of the circle with the given equation: x^2 + y^2 + 6x - 8y = 56

*August 11, 2009*

**Algebra**

If a circle of radius 5 is made to roll along the x-axis, what is the equation for the path of the center of the circle?

*August 11, 2009*

**Algebra**

find the center (h,k) and radius r of the circle with the given equation: x^2 + y^2 + 6x - 8y = 56

*August 11, 2009*

**Algebra**

Word problem: When making a phone call using calling card a call lasting 3 minutes costs $1.60. A call lasting 10 minutes costs $4.40. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that relates to the cost of making the call...

*August 11, 2009*

**Algebra**

Word problem: Ken and Kara are 29 miles apart on a calm lake paddling towards each other. Ken paddles at 3 miles per hour. Kara paddles at 6 miles per hour. How long will it take them to meet?

*August 5, 2009*

**Algebra**

Word problem: Radiator in a certain make needs to contain 50 liters of 40% antifreeze. The radiator now contains 50 liters of 20% antifreeze. How many liters of this solution must be drained and replaced with 100% antifreeze to get the desired strength?

*August 5, 2009*

**College Algebra**

Write expression as a single quotient (49-x^2)^1/2 + 3x^2(49-x^2)^-1/2 ________________________________ 49 - x^2

*July 24, 2009*

**college algebra**

factor... (x+4)^-3/5+(x+4)^-1/5+(x+4)^1/5 Please explain the process used to solve this type of expression. Answer should be in equation form if that helps....

*July 24, 2009*

**college algebra**

simplify result leave in factored form 1-7/x _____ 1+7/x

*July 24, 2009*

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