Question

Delbert prepares a 25% glugose solution of by mixing 2 ml of glucose with 8 ml of water. If he adds x ml of glucose to the solution, its concentration is given by C(X)=2+x/8+x

toxicsugar22: How many ml of glucose should delberrt add to increase the concentration to 50%

Answer 1

first find how much glucose it has by setting C(x)=.25\[.25 = {(2+x) \over (8+x)}\]

find how much glucose does a 50% concentration solution has by setting the equation equal to 50%:\[.50 = {(2+x) \over (8+x)}\]

Last, subtract the 50% x from the 25% x and you will have how much is need to add.


is that right?

Answer 2

yes

Answer 3

thamks

Answer 4

np

Answer 5

can u help me with on more

Answer 6

sure, put it up

Answer 7

The cost in thousands of dollers for extracting p% of a precious ore from a mine is given by the equation

C(p)=360p/100-p


Complete this showing the cost of extracting various percents of the ore .
if 15 is P then what is C

Answer 8

do u get it

Answer 9

don't yu just substitu 15 for P in the C(p) equation?

Answer 10

not in the 360p/100-p

Answer 11

ok so how do i do that

Answer 12

what is 15 ? p=15% ?

Answer 13

yes

Answer 14

so how do i do that can u show me please

Answer 15

the we know that p =0.15 right?

Answer 16

if we know that the cost is:
C(p)=360p/100-p

what would it be if p = 0.15?

C(0.15) = ?

Answer 17

yes can u show me this one time

Answer 18

C(0.15) = 360(0.15)/100-0.15

Answer 19

yes but it said do not convert percents to decimals

Answer 20

ok i got it

Answer 21

sorry didn't see that 15/100 then

Answer 22

ok i got it

Answer 23

with that question what percent of the ore can be extracted if 540,000 can be spent on the extraction?

Answer 24

now you set C(p) = 540,000 so,

540,000 = 360p/100-p

solve for p

Answer 25

can u show me pleae

Answer 26

540000(100-p) = 360p
54,000,000 - 540,000p = 360p
54,000,000 = 540,360p
p = 99.93

Answer 27

thanks

Answer 28

np

Answer 29

A computer store sells approximately 300 of its most popular model per year. The manager would like to minimize her annual inventory cost by ordering the optimal numbers of computers, x, at regular intervals. If she orders x computers in each shipment, the cost of storage willl be 6x dollers, and the cost of reording will be 300/x (15x+10) dollers. The inventory cost is the sum of the storage cost and the reording cost.

use the distributive law to simplfy the expression for the rerding cost. Then express the inventory cost C as a function of x

Answer 30

can u help me