1)an internet company sells cds for $10 and cassettes for $8. in one hour they sold eight times as many cds cassettes. if their sales toatled $704, hom many cds did they sell?
2)In the year 2010, 6.7% of the us population is projected to be under the age 5. If the Population will be about 298 million, about hom many people will be in this age range. Round your answer to the nearest ten thousand.
2006-07-29 10:10:56 · 10 answers · asked by schoolboi_000 1 in Science & Mathematics ➔ Mathematics
#1
let t be the # of cassettes (tapes) and
let c be the # of cds
then the first statement says
c = 8*t
or
t = c/8
and, taking the cost of each into account, the second says
$10*c + $8*t = $704
substituting in the first equation yeilds
$10*c + $8*(c/8) = $704
$10*c + $1*c = $704
$11*c = $704
c = 64
so they sold 64 cds and 8 tapes
#2
6.7% of 298 million is .067*298000000 = 19,966,000
2006-07-29 10:26:07 · answer #1 · answered by bogusman82 5 · 0⤊ 0⤋
1. Let x = number of cassettes; 8x = number of CDs
10*8x + 8*x = 704
80x + 8x = 704
88x = 704
x = 8
They sold 8*8 = 64 CDs.
2. 6.7% of 298,000,000
298,000,000 * .067 = 19,966,000
Rounded to the nearest ten thousand, this is 19,970,000
2006-07-29 18:20:28 · answer #2 · answered by jimbob 6 · 0⤊ 0⤋
1) they sold 64 Cds ($640) and 8 cassettes ($64)= $704
2) 19,960,000 of the population will be in that age range
2006-07-29 17:25:30 · answer #3 · answered by woman38 5 · 0⤊ 0⤋
8 cassettes and 64 CD's will do it
On a calculator you get 19,966,000, however reading directions carefully, rounding to the nearest ten thousand makes the answer 19,970,000
2006-07-29 17:31:05 · answer #4 · answered by MollyMAM 6 · 0⤊ 0⤋
We need more info:
1st question: Who were the artists on the CD's and cassettes?
2nd question: What is the racial breakdown of these population numbers you are giving us.
We can't answer these types of questions without this info.
2006-07-29 17:16:28 · answer #5 · answered by Anonymous · 0⤊ 0⤋
No. 1, set it up as a pair of equations. 2 unknowns require two equations.
No. 2 is ridiculously easy.
2006-07-29 17:15:23 · answer #6 · answered by AZ Ian 2 · 0⤊ 0⤋
This is the format of the problems, but you must solve them yourself.
1. let x = no. of cassettes
2. 298000000(0.067) =
2006-07-29 17:17:14 · answer #7 · answered by mom2all 5 · 0⤊ 0⤋
Number 2 is phenomenally easy.
2006-07-29 17:12:00 · answer #8 · answered by Brian L 7 · 0⤊ 0⤋
You need help? Try to go to a local tutor.
2006-07-29 17:11:55 · answer #9 · answered by teh_sexi_hotttie 4 · 0⤊ 0⤋
this stupid call sylvan
2006-07-29 17:14:11 · answer #10 · answered by reno_tony_casino 5 · 0⤊ 0⤋