Tutors Answer Your Questions about Radicals (FREE)
Question 288888: I need help with this problem: The formula in Exercise 109 accounts for the effect of gravity only on a falling object. According to that formula, how long would it take a sky diver to reach the earth when jumping from 17,000 feet? (A sky diver can actually get about twice as much falling time by spreading out and using the air to slow the fall.)
The formula is t = sqrt. h/sqrt 16
Click here to see answer by Alan3354(30982)  |
Question 289055: Solve b^4+b^2-20=0
thanks
...by any chance, is this answer correct: -2,2,-i radical 5, i radical 5?
These are my steps...please tell me if I found out the correct answer, and if I didn't, please show me the correct answer....thanks
b^2=x
b^4+b^2-20=0
x^2+x-20=0
x^2+5x-4x-20=0
x(x+5)-4(x+5)=0
(x+5)(x-4)=0
{b^2+5}{b^2-4}=0
(b^2+5)(b+2)(b-2)=0
b=2,-2
b^2=(-1)(5)
b= radical (-1)(5)
b= +/- i radical 5
b^2+b( i sqrt 5)- b( i sqrt 5)- (i^2)(sqrt 5^2)
b^2-(-1)(5)
i^2=-1
=b^2+5
So, is it correct that the answers are: -2,2,-i radical 5, i radical 5?
Click here to see answer by nerdybill(6948)  |
Question 291156: The formula t=square root of d over 16, describes the amount of time t,in seconds, that an object falls a distance of h feet.
a) write an expression in simplest form for the exact amount of time an object falls a distance of 64 feet.
b)Find the distance an object falls in 9 seconds.
Please help me I'm a 32 year old stay at home mom that has gone back to college
I can't figure this one out please help.
Click here to see answer by jim_thompson5910(28503) |
Question 292392: Rationalize the denominator. Assume that all variables represent positive real numbers and that the denominator is not zero.
7
____
9- (3 under a radical)
So it's 7 divided by 9 minus the square root of 3.
I think. I'm trying to write this so it makes sense.
Click here to see answer by solver91311(16868)  |
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