Monday

April 21, 2014

April 21, 2014

Number of results: 59

**math30**

by definition of logs: a^c = x+b x = a^c - b
*Monday, May 13, 2013 at 5:39am by Reiny*

**math30**

Thanks, but what about the odd number?
*Monday, August 5, 2013 at 2:00pm by alejandro*

**math30**

what about the phase shift in radians?
*Tuesday, November 20, 2012 at 12:50am by alejandro*

**math30**

17/23 * 700,000 = ?
*Saturday, January 26, 2013 at 10:21am by PsyDAG*

**math30**

If loga(x + b) = c, then x is equal to where a is the base. a. x = a^c – b *this is the answer* why??
*Monday, May 13, 2013 at 5:39am by alejandro*

**math30**

6/-4 = -1.5 = r -9/6 = -1.5 = r r is the ratio of every term to the one before it.
*Thursday, August 23, 2012 at 5:41pm by Damon*

**math30**

They TELL you, it grew by 40% That's 1.4 times as much.
*Wednesday, August 7, 2013 at 4:34pm by Steve*

**math30**

I am looking for help to find out if my answer is right or not! Thanks any way!!
*Wednesday, August 8, 2012 at 6:44pm by alejandro*

**math30**

n Tn 1 3(1/2)^0 = 3 2 3(1/2)^1 = 3(1/2) = 3/2 3 3(1/2)^2 = 3(1/4) = 3/4 what's the problem? They gave you the formula; just plug in values for n.
*Monday, September 10, 2012 at 3:46pm by Steve*

**math30**

Reiny I just realized "even meter" means not repeated. That help????
*Sunday, August 4, 2013 at 7:37pm by alejandro*

**math30**

Reiny I just realized "even numbers" means not repeated. That help????
*Sunday, August 4, 2013 at 7:37pm by alejandro*

**math30**

LOGARITHMS AND EQUATION SOLVING Solve for x. Round to the nearest hundredth. 2^(x+3) = 17^(x)
*Wednesday, July 18, 2012 at 3:45am by alejandro*

**math30**

Write the first three terms of the following geometric sequence: tn = 3(1/2)n-1.
*Monday, September 10, 2012 at 3:46pm by alejandro*

**math30**

-2.5 = log H+ 10^-2.5 = H+ = .00316 By the way I do not understand the notation used in your other problem.
*Tuesday, July 10, 2012 at 5:11am by Damon*

**math30**

Find the amplitude, period, phase shift, and vertical displacement for: y=7sin5(x-85degrees)-1.2
*Tuesday, November 20, 2012 at 12:50am by alejandro*

**math30**

Steve Looks thanks so much for your time but you are telling me the same questions without answer my question! don't worry!
*Wednesday, August 7, 2013 at 4:34pm by alejandro*

**math30**

Determine the sum of the following geometric series. Round your answers to 4 decimals if necessary. a) 50 over sigma k=1 8(.5)^k-2
*Wednesday, September 26, 2012 at 12:42am by alejandro*

**math30**

just read 'em off the function amplitude 7 period 2pi shift 85 degrees displ -1.2
*Tuesday, November 20, 2012 at 12:50am by Steve*

**math30**

Umm, because it was given: "every other term is one half of the previous term"
*Wednesday, August 22, 2012 at 5:30pm by Steve*

**Math30**

An angle with a negative rotation passes through the point(-5,-8). To, the nearest degree what is the measure of the angle?
*Wednesday, November 17, 2010 at 9:50pm by Bulbul*

**math30**

take the ln of both sides (x+3)*ln2=xln17 x(ln2-ln17)=-3ln2 and solve for x.
*Wednesday, July 18, 2012 at 3:45am by bobpursley*

**math30**

Write the first three terms of a geometric sequence that has a first term of a = 7 and a common ratio, r, that satisfies r2 = 9.
*Monday, September 10, 2012 at 3:52pm by alejandro*

**math30**

Solve log2(x-1) = 5-log2(x+3) for x. base 2.
*Wednesday, July 25, 2012 at 3:55pm by alejandro*

**math30**

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. 1/6 * 1/6 = ?
*Saturday, January 26, 2013 at 10:19am by PsyDAG*

**math30**

The number of three digit or four digit even numbers that can be formed from the numbers 2, 3, 5, 7 is A.72 B.120 C.144 D.5040
*Sunday, August 4, 2013 at 7:37pm by alejandro*

**math30**

r = .5 Just as in your other problem, r in a geometric sequence is the ratio of every term to the one before it. That is the very meaning of a geometric sequence.
*Thursday, August 23, 2012 at 5:34pm by Damon*

**math30**

1.Use the laws of logarithms to express log2 (6) â€“ log2 (3) + 2log2 (8)^1/2 as a single logarithm; then evaluate. 2. For logy = log(0.5x â€“ 3) + log2, express y as a function of x.
*Tuesday, July 10, 2012 at 5:10am by alejandro*

**math30**

Apparently you forgot to mention that the population grew by 40% EACH YEAR from 1994 to 1998 That means that it grew by a factor of 1.4 each year, so in 4 years, it grew by 1.4^4. So, x*1.4^4 = 963300 x = 250755, or 250800 after rounding.
*Wednesday, August 7, 2013 at 4:34pm by Steve*

**math30**

1.To play a game, a die is rolled to see who plays first. Four players are going to play the game. What is the probability that at least two people roll the same number? Express your answer to the nearest tenth of one percent
*Saturday, January 26, 2013 at 10:19am by alejandro*

**math30**

let's see. You know there are 10 digits You know there are 5 even digits. asking now how many odd digits there are is the same as holding out both hands, and when someone says, "This one is your left hand," you ask, well, which one is my right hand?
*Monday, August 5, 2013 at 2:00pm by Steve*

**math30**

The sum of the first 10 terms of the geometric sequence -4, 6, -9,..., to the nearest tenth, is; The answer is: For the geometric series a=-4, r=-1.5 or -3/2, n=10. Sn= a(r^n - 1)/r - 1 S10= -4((-1.5)^10 - 1)/-1.5 - 1 S10= 90.7 My question is from where they got r=-1.5 or -3/2...
*Thursday, August 23, 2012 at 5:41pm by alejandro*

**math30**

substitute the value: pH = -log[H+] 2.5 = -log[H+] -2.5 = log[H+] note that log has a base of. Thus to get [H+], raise both sides of equation by 10 (to cancel the log): 10^(-2.5) = [H+] [H+] = 3.2 x 10^(-3)
*Wednesday, July 11, 2012 at 12:45pm by Jai*

**math30**

1. Your city has 700 000 households, and the probability that a household has exactly one vehicle is 17/23. a) Determine the number of households that can be expected to have exactly one vehicle.
*Saturday, January 26, 2013 at 10:21am by alejandro*

**math30**

since it's (x-3)^2/4 - (y+1)^2/16 = -1 that's the same as (y+1)^2/16 - (x-3)^2/4 = 1 so the hyperbola is vertical. The x-values go from -∞ to ∞, and so do the y-values, but the interval between the vertices (-5,3) is excluded. Look up any web page explaining the ...
*Wednesday, October 10, 2012 at 12:32pm by Steve*

**math30**

r^2 = 9 r = 3 or -3 terms: 7 21 63 . . . or: 7 -21 63 . . .
*Monday, September 10, 2012 at 3:52pm by Steve*

**math30**

The mass of a radioactive sample is represented in the graph below. The initial mass of 32 mg decays to 8 mg after 21 hours. 1)What is the half-life of the radioactive sample, in minutes? 2)Solve each equation. a. 4 8x-1 = 8 b. 3^(2x-5) = 1/27x
*Tuesday, July 3, 2012 at 4:16am by alejandro*

**Math30-1**

Your search for a researcher has determined that an equation that models the height of a particular species of tree is y=20.2log(x), where y is height in metres and x is time in years. Predict the height of the tree after 30years and predict how old the tree will be when it is...
*Friday, June 7, 2013 at 5:32pm by dano*

**math30**

A sequence has a first term of 24 and every other term is one half of the previous term. Find a recursive formula that defines this sequence. The answer of this question is: an=an-1*1/2 Somebody can help me and let me know why is 1/2 on the formula? please please!!!
*Wednesday, August 22, 2012 at 5:30pm by alejandro*

**math30**

Either you are lost, or are looking for someone to give you answers. I will assume the former for now: a) 24, 12, 6,3, ... b) an=an-1*1/2 c. tn=24*(1/2)n t6= 24*(1/2)^6=24/64
*Wednesday, August 8, 2012 at 6:44pm by bobpursley*

**math30**

number of possible committees without restrictions = C(19,7) = 50388 number of committees with the specified 4 adults = 1 x C(15, 3) , (we must still choose 3 of the remaining 15)= 455 prob of your event = 455/50388 = 35/3876 = .0090 = appr .9%
*Friday, January 25, 2013 at 3:29am by Reiny*

**math30**

The formula for determining the pH of a solution is pH = -log[H+], where [H+] is the hydrogen ion concentration (in M/L). What is the hydrogen ion concentration of an acid with a pH of 2.5?
*Tuesday, July 10, 2012 at 5:11am by alejandro*

**math30**

The formula for determining the pH of a solution is pH = -log[H+], where [H+] is the hydrogen ion concentration (in M/L). What is the hydrogen ion concentration of an acid with a pH of 2.5?
*Wednesday, July 11, 2012 at 12:45pm by alejandro*

**Math30-1**

what's the trouble? y(30) = 20.2 log(30) when y=15, 20.2 log(x) = 15 and just solve for x
*Friday, June 7, 2013 at 5:32pm by Steve*

**math30**

The growth of a $40 000 investment is shown in the table. Time (years) Value ($) 0 40 000 1 42 600 2 45 369 3 48 318 4 51 459 5 54 803 Use the exponential regression function on your calculator to get the function. Round a to the nearest dollar and b to the nearest thousandth ...
*Tuesday, July 3, 2012 at 3:20am by alejandro*

**math30**

A sequence has a first term of 24 and every other term is one half of the previous term. Find a recursive formula that defines this sequence. The answer of this question is: an=an-1*1/2 Somebody can help me and let me know why is 1/2 on the formula? please please!!! I am not ...
*Thursday, August 23, 2012 at 5:34pm by alejandro*

**math30**

how many even digits are there from 0 - 9 ?? there are 5 how many digits are there from 0 to 9 ? there are 10 so you have 5 choices as the first digit, 5 choices again for the second digit, 10 choices for the 3rd digit, etc
*Monday, August 5, 2013 at 2:00pm by Reiny*

**math30**

The number of cellular phone customers of a particular telephone company increased by an average of 40%/a from 1994 to 1998. If there were 963 300 customers on January 2, 1998, then the number of customers on January 2, 1994, to the nearest hundred, would have been Answer: ...
*Wednesday, August 7, 2013 at 4:34pm by alejandro*

**math30**

Log2(x-1) = 5 - Log2(x+3). Log2(x-1) + Log2(x+3) = 5 Log2((x-1)(x+3)) = 5 Log2(x^2+3x-x-3) = 5 Log2(x^2+2x-3) = 5 x^2 + 2x -3 = 2^5 = 32 x^2 + 2x -3 -32 = 0 x^2 + 2x -35 = 0 (x-5)(x+7) = 0 x-5 = 0 X = 5. x+7 = 0 X = -7. Solution set: X = -7, X = 5.
*Wednesday, July 25, 2012 at 3:55pm by Henry*

**math30**

A committee is to be formed to investigate what activities teenagers have available in small communities. The committee is to have 7 members, chosen randomly from interested community members. There are 10 parents, 5 teenagers, and 4 adults without children who have all ...
*Friday, January 25, 2013 at 3:29am by alejandro*

**math30**

The 1933 earthquake in Japan registered 8.9 on the Richter scale. a.The 1985 earthquake in Peru registered 7.7 on the Richter scale. How many more times intense was the earthquake in Japan? Round your answer to one decimal place. b. What would the Richter scale reading be of ...
*Wednesday, July 11, 2012 at 12:48pm by alejandro*

**math30**

8 is 1/4 of 32, so two half-lives = 21 hours. half-life is 10.5 hours 4^(8x-1) = (2^2)^(8x-1) = 2^(16x-2) = 8 = 2^3 so, 16x-2 = 3 x = 5/16 assuming 1/27x = (1/27)*x, 3^(2x-5) = (3^-3)x (2x-5)log3 = -3log3 + logx (2x-2)log3 = logx nope assuming a typo, and the x on the right ...
*Tuesday, July 3, 2012 at 4:16am by Steve*

**math30**

Sequences 1)A sequence has a first term of 24 and every other term is one half of the previous term. a)Write the first four terms of the sequence. b)Find a recursive formula that defines this sequence. c)Find an explicit formula that defines this sequence. This will be ...
*Wednesday, August 8, 2012 at 6:44pm by alejandro*

**math30**

Children’s meals are being prepared for a large gathering. There is an equal number of chicken, hamburger, and fish meals. Each meal comes with a toy: a ball, a parachute toy, or a Frisbee. There are twice as many balls as Frisbees and an equal number of parachutes and ...
*Friday, January 25, 2013 at 3:28am by alejandro*

**math30**

Prob(ball) = 2/4 = 1/2 prob(parachute) = 1/4 prob(frisbee) = 1/4 prob(chicken) = 1/3 prob(fish) = 1/3 prob( chicken or fish AND a ball) = (1/3)(1/2) + (1/3)(1/2) = 1/6 + 1/6 = 1/3
*Friday, January 25, 2013 at 3:28am by Reiny*

**math30**

Question: Can digits be repeated, e.g. is 332 allowed as a 3 digit number? both groups must end with a "2" I will assume digits may repeat number of 3 digit even numbers = 4x4x1 = 16 number of 4 digit even numbers = 4x4x4x1 = 64 total = 80 mmhhh? suppose we can't repeat 3digit...
*Sunday, August 4, 2013 at 7:37pm by Reiny*

**math30**

I assume you mean 50 ∑ 8(.5k-2) k=1 In that case S50 = a(1-r)^50/(1-r) r = .5 a = 8(1/2^-1) = 16 S50 = 16(.5^50)/.5 = 2^4 * 2^-50 * 2^1 = 2^-45 or 1/2^45
*Wednesday, September 26, 2012 at 12:42am by Steve*

**math30**

A security code used to consist of two odd digits, followed by four even digits. To allow more codes to be generated, a new system uses two even digits, followed by any three digits. If repeated digits are allowed, the increase in the number of possible codes is____ Answer: ...
*Monday, August 5, 2013 at 2:00pm by alejandro*

**math30**

The Mean and the Standard Deviation Last year, golfers at Smith Ranch golf course had a mean score of 41 and a standard deviation of 2 on the first nine holes of the course, and a mean of 38 and a standard deviation of 1.8 on the last nine holes. One afternoon, Nathan scored ...
*Wednesday, February 13, 2013 at 3:17am by alejandro*

**math30**

The equation of the hyperbola is (x-3)^2/4 - (y+1)^2/16 =-1. What is the range? All I know is this but I am not even sure what I am doing!! My answer: The general form of the equation of a horizontally aligned hyperbola is: (x-h)^2/a^2 - (y-k)^2/b^2 =1. So the (y-k)^2/b^2 term...
*Wednesday, October 10, 2012 at 12:32pm by alejandro*

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