/sci/ - Science & Math

Hi there /sci/ i'm new here and I'm just a freshman high school student so I need you guys to help me with some of my homework and sorry for asking I don't have a tutor to instruct me, I have these as a homework for tommorow I tried to solve them but i'm not so sure about it, so here we go (the square root cover the whole equations and by ^ it mean cube root cause is only up to 4)

1) Solve in R the following inequalities and equations :

A) √2x2-8x+15 = 2x-3
B) √x+7 + √2x-3 = 4
C) √1-√x^4-x2 = x-1
D) x + 1 >= √|x+3|
E) √3-x - √-5x-4 -1 < 0
F) 2√x+1/1-2√3-x < 1

And thank you very much for the help :D

So this is very embarrassing and pathetic to be asking...but I just completely suck balls at rounding....

How do I know which place to round to if it doesn't tell me which place to round to? For example:

Convert 75mph into km/h, I did 75mph X 1.609

according to a chart I got in class, 1mph = 1.609 km/h, but anyway, my final answer was 120.675....so do I round it to 120.7 or 120.68???

I know this makes me sounds fucking retarded, but please help me out

Lot of trouble on a stats hw question! Please help!

People with type O-negative blood are universal donors whose blood can be safely given to anyone. Only 7.2% of the population have O-negative blood. A blood center is visited by 500 donors. What is the probability that at least 40 of those are universal donors?

Instructions:
1. Clearly state the values of n, p, and X. State the question above in terms of the X variable
2. Answer the question above by using the binomial probability distribution function.
3. Construct a probability distribution for X (a table) and make a graph (a histogram).
Hint: To clearly see a bell-shape of the distribution, choose a range of X values where the probabilities are not too small. You may want to highlight that portion of the table so that you know which X values have been selected.
4. Verify that the conditions to use normal distribution are satisfied
5. Use Normal calculations to approximate the probability in the question above.

hey guys ! i'm asking for a little help ! i couldn' find the answer
1- ∑_(k=1 to 99 ) 〖(1+i)^k〗
in the form of
a+bi ; a,b => reals
2- (z+1)^5 = 1/2-((V3)/2)i
(z-1)^3 = 3(V3i)

Hey /sci/

If a spring with a spring constant of 10 N/m is compressed by a 3 kg block of whatever 12 meters, what's the speed at the end of the 12 meters? It doesn't apply 120 N the full 12 meters, does it?

Hi all. I need help with this bit of math... Please spare me the usual smug bullshit I see here all the time. I'm frustrated with this thing as it is.

If I could get it stage by stage that would be very neat, because I know the answer, which is the square root of 2.

2^(1/3) * 2^-(1/4)
------------------------
(2*(1/12))^-5

Those dashes are a fraction line :D

any help would be appreciated
A thermometer is taken from a room where the temperature is 20°C to the outdoors, where the temperature is 3°C. After one minute the thermometer reads 11°C. (Round the answers to one decimal place.)
(a) What will the reading on the thermometer be after one more minute?
°C

(b) When will the thermometer read 4°C?
minutes

<span class="math">\frac{dy}{dt} = \frac{-2y}{(1+t)^3}[/spoiler]

How do I integrate this motherfucker?