Member: idenny

28 Questions
27 Answers

1802

+216

College algebra #11

On April 7, 2011, an earthquake of magnitude 6.5 on the Richter scale struck Veracruz, Mexico. On August 23, 2011, an earthquake of magnitude 5.8 on the Richter scale shook the East Coast of the United States. (Round your answers to two decimal places.) read more ..

●●●

idenny Apr 11, 2017

947

+216

College algebra #11

Solve the exponential equation for t. You may use either the common logarithm or the natural logarithm. (Round your answer to two decimal places.)

2 × 5^t = 22
t= ________? read more ..

●

idenny Apr 11, 2017

2598

+216

College Algebra #10

The apparent brightness of a star observed from Earth is a logarithmic function of the intensity of the light arriving from the star. Astronomers use the magnitude scale to measure apparent brightness. The relative intensity I is read more ..

●●●●●

idenny Apr 11, 2017

1450

+216

College Algebra #9

Illustrate applications of the logarithm.
Stars have an apparent magnitude m, which is the brightness of light reaching Earth. They also have an absolute magnitude M, which is the intrinsic brightness and does not depend on the distance read more ..

●●

idenny Apr 11, 2017

1250

+216

Apology.

I just want to send out an apology for my last post about getting ignored. I am truly sorry for what I posted.. I just had a bad day and didn't mean to put my anger out on all of you. I hope you guys have a good day, and also accept my apology. read more ..

●●●●●●

idenny Mar 29, 2017

1154

+216

.....

I'm literally waiting 50 min for this question to be answered and it seems like im getting ignored, while questions asked after my question is being answered.

●●●●●●●

idenny Mar 29, 2017

1155

+216

College Algebra #9

A population of animals is growing exponentially, and an ecologist has made the following table of the population size, in thousands, at the start of the given year.
Year 2007 2008 2009 2010 2011 2012 Population in thousands 5.240 5.450 5.668 read more ..

●●

idenny Mar 29, 2017

878

+216

Algebra #7

A quantity decreases by 7% for each of 10 years. What is its percentage decrease over the 10-year period? (Round your answer to two decimal places.)

idenny ●●

idenny Mar 17, 2017

1089

+216

College Algebra #7

A certain quantity Q has initial value 200 and decays by 20% each year. Give an exponential function that describes this quantity. (Use t in years as your variable.)
_____

●●

idenny Mar 17, 2017

1366

+216

College Algebra #6

In this exercise we consider data from the Statistical Abstract of the United States on the fraction of women married for the first time in 1960 whose marriage reached a given anniversary number. The data show that the fraction of women who reached read more ..

CPhill ●●●●●●

idenny Mar 17, 2017

1211

+216

college algebra #5

According to one source, the amount of data passing through mobile phone networks doubles each year.

(a) Explain why the amount of data passing through mobile phone networks is an exponential function of time.
read more ..

●

idenny Mar 15, 2017

1924

+216

college algebrea

A children's fairy tale tells of a clever elf who extracted from a king the promise to give him one grain of wheat on a chess board square today, two grains on an adjacent square tomorrow, four grains on an adjacent square the next day, and so on, doubling read more ..

●●●

idenny Mar 15, 2017

837

+216

college algebra

During the period from 2003 through 2010, gold prices doubled every 3 years (approximately).
(a) What was the yearly growth factor for the price of gold during this period? (Round your answer to two decimal places.) ________.
(b) Explain read more ..

idenny Mar 14, 2017

3086

+216

college algebra

Iodine-131 is a radioactive form of iodine. After the crisis at a Japanese nuclear power plant in March 2011, elevated levels of this substance were detected thousands of miles away from Japan. Iodine-131 has a half-life of 8 days. What is the daily decay read more ..

●●●

idenny Mar 14, 2017

988

+216

college algebra

A certain quantity has a century decay factor of 0.4. What is its yearly decay factor? (Round your answer to two decimal places.) _________

●

idenny Mar 14, 2017

2250

+216

college algebra

●●

idenny Mar 14, 2017

2971

+216

College Algebra

Your family likes to eat fruit, but because of budget constraints, you spend only $18 each week on fruit. Your two choices are apples and grapes. Apples cost $0.20 per pound, and grapes cost $0.60 per pound. Let a denote read more ..

●

idenny Feb 26, 2017

1141

+216

This exercise explores elementary properties of linear functions.

This exercise explores elementary properties of linear functions.
Suppose y is a linear function of x. Increasing x by 2.4 units causes a 7.8-unit increase in y. What is the slope? (Round your answers to two decimal places.)

______ read more ..

●

idenny Feb 25, 2017

+216

Nevermind, I have found the answer!

idennyMar 15, 2017

+216

thanks

idennyMar 15, 2017

+216

these are wrong. except 1.26

idennyMar 14, 2017

+216

Can you please tell me how you got 17.5 in details? Step by step?

idennyFeb 25, 2017

+216

never mind, the answer is "0"

idennyFeb 15, 2017

+216

Thanks dad!

idennyJan 24, 2017

+216

The answer is 72.752

idennyJan 20, 2017

+216

still wrong

idennyJan 20, 2017

+216

i need to know how much money per year.

idennyJan 20, 2017

+216

CPhill - I found the answer.

m = (16, 136, 72)

66+6.3(136)+12.7(72)-6.8(16)

= 1728.4

idennyJan 17, 2017

Username	idenny
Score	216
Membership
Stats
Questions	25
Answers	27