(please explain how you did it)
given y varies inversely as x.
a.) if y is 8 when x is 3, find x when y is 4.
b.) if x is 12 when y is 5, find y when x is 15
c.) if y is 16 when x is 1/2, find x when y is 1.
d.) the frequency of a vibrating string is inversely proportional to its length. A violin string 10 inches long vibrates at a frequency of 512 cycles per second. Find the frequency of an 8-inches string.
" i'll give points....i promise "
2007-05-21 12:58:18 · 6 answers · asked by iluvkikyam 2 in Science & Mathematics ➔ Mathematics
wait there's more
simplify.....
a.) b^2-3b-15 / b^2-6b+5
b.) 14x^4y^2 / 21x^3y^3
2007-05-21 13:24:54 · update #1
MORE.... im sorry
simplify...
a.) 5/2x + 7/6x^2
b.) 1/5a - 4/7a^2
c.) fins the measure of two supplementary angles if their are in a ration of 4:6
" i'll give extra points... "
2007-05-21 13:43:46 · update #2
If y varies inversely as x, then when you double y you must halve x
x times y equals a constant (let's call it "c")
y = c/x
(a)
if you halve y then you must double x. This is to say if you are multiplying y by (1/2) you must then multiply x by (2/1) the inverse of (1/2)
x = 6
(b)
x is multiplied by 15/12 (or 5/4) therefore you must multiply y by the inverse (4/5)
y = 4
(c)
You multiply y by 1/16
Therefore you must multiply x by 16/1
x = 8
(d)
if you multiply the string length by 8/10 you must multiply the frequency by 10/8
So frequency = 5120/8 = 640 cycles per second
2007-05-21 13:00:56 · answer #1 · answered by Orinoco 7 · 1⤊ 0⤋
a. 8/3 = 4/x as you can see, y is halved, so inversely x is doubled. x is 6.
b. 12/5 = 15/x in this one x is multipled by 1 1/4, so y will be divided by it. the answer is 5/ 1.25 = 4
c. 16/.5 = 1/x y is divided by 16, so x is multiplied by 16 to make it 8.
d. 10/512 = 8/x same thing here, y is divided by 1.25, so 512*1.25 is the answer.
you better love me for this
2007-05-21 13:07:14 · answer #2 · answered by shinko58 1 · 1⤊ 0⤋
i know how to do the first one im pretty sure.
y = 8 and x = 3, so you want y to be 4, so that would be half the original number, so you do half of 3 too.
so x would be 1.5
2007-05-21 13:02:08 · answer #3 · answered by bipolarsomeone 2 · 1⤊ 1⤋
Answer and star
2016-05-19 02:44:38 · answer #4 · answered by ? 3 · 0⤊ 0⤋
I just added what was between each number.
2007-05-21 13:01:29 · answer #5 · answered by Anonymous · 1⤊ 1⤋
A) 1.5?
B) 5.25?
C)1/32?
D)409.6?
Hey i tried if it's wrong sorry if it is. T_T
2007-05-21 13:03:05 · answer #6 · answered by James L 2 · 1⤊ 1⤋