Aleguan

14 Questions
22 Answers

0

719

0

+119

(Photoelectric effect) Finding velocity of ejected electron given initial and final wavelengths of X-ray

Hey, I'm in my senior year of highschool and I'm stuck on this problem that deals with things I haven't even learned (Canadian education system for ya). It has to do with the photoelectric effect.
Given the wavelengths of an X-ray before and after read more ..

Aleguan Feb 21, 2019

+1

1626

6

+119

Combinatorics Problem

"Your baseball team enters a best out of 7 series. How many different ways can you win in exactly 6 games?"
My attempt was...
-4, 5 or 6 wins out of 6 games
-order doesn't matter
6C4=15 <#> 6C5=6 <#> 6C4=1
6*15=90... 90 ways? <#> ...but read more ..

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Aleguan Feb 19, 2018

0

1063

2

+119

Combinatorics Problem

How many numbers (up to a maximum of four digit numbers) can be made from the digits 2, 3, 4, and 5 if no digit can be repeated?
I don't think I've gone over this yet in my course's material so I really have no clue how to even start answering this problem. read more ..

Aleguan Feb 15, 2018

0

1286

2

+119

Exponential Growth Question

In just 5 weeks the population goes from 100 to 1000. What is the doubling time of this population? As in, how long does the population take to double?
i tried 1000=100(2)(t/5), where t is time in weeks
10=2(t/5)
log210=t/5
log(10)/log(2)=t/5 <#> 5*3.322=t <#> t=16.61 <#> 16.6 read more ..

Aleguan Jan 31, 2018

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1445

2

+119

Richter Scale Question

"What is the Richter Scale measurement for an earthquake that is 5 times as intense as an earthquake measuring 8.2 on the Richter Scale?"
I understand that the measurement of magnitude is exponential but I don't know how to apply that information and read more ..

Aleguan Jan 30, 2018

0

1257

3

+119

Inverse of a function?

Just a little quickie, since Google won't help me out.
g(x) = 9^(x)-3
h(x) = g^(-1)(x)
Is g^(-1)(x) equal to (1/g)(x) or 1/(g(x))? In other words, would g^(-1) be equivalent to 1 over all of 9^(x)-3?

Aleguan Jan 23, 2018

0

2074

3

+119

Solution of sin(x)=1-2cos^2(x)

"Simplify using identities so that you can solve the equation. Give the general solution in radians."
sin(x)=1-2cos^2(x)
I ended up getting...
x = - pi/6 + n2pi, x = - 5pi/6 + n2pi, x = pi/2 + n2pi
...which apparently is incorrect. I'd appreciate read more ..

Aleguan Jan 16, 2018

0

1545

2

+119

Non-permissible values of x

Can't figure out all of the non-permissible values of (cot(x))/(2sin^2(x)-1).
So far I've got 0, 1 and pi +npi (n being any integer) but I'm not even sure if those are right. Any help would be much appreciated.

Aleguan Jan 15, 2018

0

1143

0

+119

Permissible values?

I've learned what non-permissible values are but not permissible values and yet I need to know for a problem here. Are they just any value besides the non-permissible values? Or like waaat

Aleguan Jan 11, 2018

+1

1282

2

+119

Inverse of a quadratic equation when x = -2

"Given f(x)=-3x^2-7x+19 and g(x)=2x^2-4x-5 find the following:"
"e. g^-1(-2) ..... (Hint: There are actually two answers here.)"
I've tried using the formulas and steps I've been given to find inverses of linear equations as well as using the quadratic read more ..

Aleguan Nov 20, 2017

0

1225

3

+119

f(x) = (x^2+2x+3)/3 still a rational function?

Would f(x) = (x^2+2x+3)/3 be considered a rational function? I'm not quite sure what the guidelines are with classifying the various types of functions.

Aleguan Nov 4, 2017

0

1363

5

+119

Absolute value graphing stuff

"If the graph of y=f(x) passes through the point (-1/2,-2/3), then the graph of y=|f(x)| must pass through the point _____."
I don't know how to graph a graph given only one point... :/ I've tried to look stuff up but haven't found anything similar to read more ..

hectictar ●●●●●

Aleguan Jun 14, 2017

0

1635

1

+119

In a geometric sequence, t4=5x-11, t5=x+5 and t6=x-1. Find the sum(s) of the infinite series if it (or they) exist(s).

In a geometric sequence, t4=5x-11, t5=x+5 and t6=x-1. Find the sum(s) of the infinite series if it (or they) exist(s).
So uh... what does that mean and what do I do and how do I do it? I really have no clue how to even start answering this question... read more ..

Aleguan May 29, 2017

0

2232

3

+119

Multiplying both sides of an equation...?

Yo, guys, so here's the deal... if both sides of an equation are fractions with 8 being the denominator, is it fine to multiply both sides by 8 so it's easier to work with? Is that how math works...? Also, in case you were wondering, the equation I'm dealing read more ..

Aleguan Nov 15, 2016

+119

0

I'm sorry, I don't understand what you mean...

AleguanFeb 19, 2018

+119

+2

Hm, ok thanks. Not sure what log means though...

AleguanJan 23, 2018