Posted by Desire on October 14, 2002 at 01:01:48:
In Reply to: Ok I tried can someone check to see if I am right please. posted by Desire on October 14, 2002 at 00:45:04:
c) when should u rent from rent a truck rather than Sams u-drive?
when you are going to drive less than 400 miles.
: D) When should u rent rom Sams U-drive rather than Rent a truck? When you are going to drive more than 400 miles
: : 1) The volume of a cone is V= 1/3 Pie r squared. Rewrite th formula for H in tems of V nd R?? please show the steps please..
: I still can't do that one, I don't undestand what happened to the H :(
: : 2) If A is directly proportional to the cube of b, write the equation.
: A= k (b^3)
: : 11) Mrs Johnon is 3 times as old as her son. Ten years ago she was 5 times as old as her son was then. Find Mrs Johnon's present age?
: Son = x
: Mrs J = 3x
: 5(x - 10) = 3x -10
: 5x - 50 = 3x-10
: 2x = 40
: x = 20
: 5(25) - 10 = 125 -50 = 75
: 20*3 = 60 is Mrs. J
: 10 year ago mrs j was 50 and her son was 10, wow she was 40 when she had him.
: : 12) John in 5 years older then Mary. Ten years from now,the sum of their ages will be 39. How old is John now?
: John = J
: Mary = M
: J = 5 + M
: J + M = 39
: 5+M + M = 39
: 2M = 34
: M = 17
: so J = 22
: check 17 + 22 = 39
: : 13) Jaime has a 15% discount coupon for Foleys Red apple Sale. If se buys a shirt for $25 and jeans for $35 (regular price), write an equation that show the
: : A) discount she would get
: (25+35)*.15 = 9
: : b) amount she would pay with the discount coupon
: (25+35)*(1-.15)= 51
: so she pays $51 for the stuff
: : 14) a) If y varies directly as x and y=-16 when x=2 find y when x=-12
: y = k x
: -16= (k) 2
: -8 = k
: y = (-8)(-12)
: y= 96
: I am not sure if this is right
: : b) If y varies directly as x and y=-12 when x=-18, find x when y=24
: y = k x
: -12 = (k)(-18)
: -12/-18 = k
: 2/3=k
: 24/(2/3)=x
: x = 36
: I am not sure if this is right
: : 16) write variation equaion for the following:
: : a) intesity I of lightvarie inversely as the square of the observers distance d from the light source
: I = k/(d)^2
: I am not sure if this is right
: : b) price of pizza p varies diectly with the square of its diameter
: p = k(d^2)
: : 20) one number is twice another #. If u take one-fourth of the lesser # and subtract it from the greater # u get 21 find the leser # and the greater #??
: x = 2y
: (x/4)-2y=21
: (2y/4)-2y = 21
: (2y)-8y=84
: 6y=64
: y = 8
: so the lesser would be 4 since 4 = (8/2) and the greater would be 8.
: : 21) Rent--Truck's rates are $50 per day plus $0.50 per mile and Sam's U-Drive's are $70 a day plus $).45 per mile.
: : a) Find the mileage at which the cost for the two will be the same?
: 50 + (.5x) = 70 + (.45x)
: .05 x = 20
: Rent Trucks = 50 +(.50*400) = $250
: U drive = 70 + (.45 * 400) = $250
: : c) when should u rent from rent a truck rather than Sams u-drive?
: when you are going to drive more than 400 miles.
: : D) When should u rent rom Sams U-drive rather than Rent a truck? When you are going to drive less than 400 miles
: : PLEASE EXPLAIN AND SHW ME HOW U GOT THE ANSWERS PLEASE!!!!