Mathematics - 19 November 2007

2007-11-19 23:59:56 · 4 answers · asked by Laurie C 1

37. A boat goes downstream a distance of 5 mi in 15 min, but it takes 20 min for the return trip. Find the rate of the boat in still water and the rate of the current.

38. An airplane travels a distance of 1980 mi in 6 hr with the wind, but it takes 20 min for the return trip. Find the rate of the airplane in still air and the rate of the wind.

39. It takes a man 23 min longer to jog 5 mi than it takes his son to run the same distance. However, if the man doubles his rate, he can run the distance in 1 min less than his son. What is the man’s rate of jogging and what is his son’s rate of running?

40. The distance between two automobiles is 140 km. If the cars are driven toward each other, they will meet in 48 min. However, if they are driven in the same direction, they will meet in 4 hr. What is the rate at which each car is driven.

2007-11-19 23:23:54 · 3 answers · asked by squall_cloud 1

34. A woman has a certain amount of money invested. If she had $6000 more invested at a rate 1 percent lower, she would have the same yearly income from the investment. Furthermore, if she had $4500 less invested at a rate 1 percent higher, her, her yearly income from the investment would also be the same. How much does she have invested, and at what rate is it invested?

35. A chemist has two acid solutions. One contains 15 percent acid and the other contains 6 percent acid. How many cubic centimeters of each solution should be used to obtain 400cm3 of a solution that is 9 percent acid?

36. A tank contains a mixture of insect spray and water in which there are 5 gal of insect spray and 25 gal of water. A second tank also contains 5 gal of spray but only 15 gal of water. If it is desired to have 7.5 gal of a mixture of which 20 percent is spray, how many gallons should be taken from each tank?

2007-11-19 23:20:06 · 1 answers · asked by squall_cloud 1

2007-11-19 22:56:22 · 11 answers · asked by Anonymous

If "x" men can do a job in "h" days, how long would "y" men take to do the same job.

A)x/h
b)xh/y
c)hy/x
d)xy/h

Please show step by step if possible. Thanks

2007-11-19 22:44:02 · 6 answers · asked by Sufian 2

i study a electronics module at high school.

the assessment is worked out like this:

exam is 50%
test is 20%
exercises 30%

in order to pass the module, i need to get 40% or more to pass the module.

can some one tell me what i should get in each assessment in order to pass at 40%?

how did you work it out?please help?

2007-11-19 20:38:44 · 6 answers · asked by . 1

how can i arrange the digits from 10 to 18 in a 3x3 table like so that every row, column and diagonal totals the same amount.

any ideas how that is done, or how i can do it?

2007-11-19 20:22:51 · 4 answers · asked by . 1

How tall is Tony Blare.. , and Gorden brown?as they look tall on Tv

2007-11-19 20:05:35 · 3 answers · asked by Anonymous

Take That the boyband

2007-11-19 19:53:59 · 3 answers · asked by Anonymous

y=(-1/(a+(x^2/a)))+3a/(x^2-a^2)

2007-11-19 19:42:26 · 2 answers · asked by j_r_colbert 2

2007-11-19 19:30:24 · 5 answers · asked by Anonymous

Please show your work, including division.

2007-11-19 19:09:14 · 7 answers · asked by ♥Ebonique♥ 2

please give good explanation
Given that a solution exists, solve the following tower of powers problem: X^x^x^x^x…=2

2007-11-19 19:06:27 · 2 answers · asked by Anonymous

2007-11-19 19:04:57 · 4 answers · asked by starrynight 4

2007-11-19 18:57:19 · 1 answers · asked by starrynight 4

2007-11-19 18:52:32 · 4 answers · asked by starrynight 4

Please show your work, including the division.

2007-11-19 18:42:18 · 8 answers · asked by ♥Ebonique♥ 2

Can you please show me step my step on how to divide these.

P stands for the power (exponets)

#1. x(4th P) - x(3rd P)y + 2x (2nd P)y (2nd P)- xy (3rd P)
+ y(4th P) divided by x (2nd P) + y(2nd P)

#2. 8m(3rd P)+ 8m(2nd P)n+ 4mn (2nd P) + n (3rd P)
divided by 2m +n

#3. a(4th P) + a (3rd P) + 4a (2nd P)+ 0a
divided by 2a +a(2nd P) +4

2007-11-19 18:40:17 · 3 answers · asked by ღLala Loveღ 4

2007-11-19 18:39:08 · 1 answers · asked by starrynight 4

2007-11-19 18:10:56 · 3 answers · asked by Anonymous

like:
S(n+1)=S(n)+9
| |
| |
\/
Explicit form?!

2007-11-19 18:05:54 · 2 answers · asked by Roshan R 2

Please show me the division problem.

2007-11-19 18:04:56 · 10 answers · asked by ♥Ebonique♥ 2

The travel time for a college student to get between home and school is uniformly distributed between 40 and 70 minutes. This student leaves home each school morning to go to school exactly 1 hour before her class time starts. On what proportion of school days will she be late to class?

2007-11-19 17:59:47 · 5 answers · asked by ilmm98 2

can u show me a step by step for this . How to simplify this radical. For Algebra II

(3/4) ^ (1/3)

2007-11-19 17:56:12 · 4 answers · asked by brobo8 1

Suppose the payoff of a $1 ticket in a tri-state lottery game is $500 with a probability of .0005 and $0 the rest of the time. Let X be the random variable that represents a payoff. What is the payoff of x, on average?

2007-11-19 17:38:20 · 2 answers · asked by ilmm98 2

2007-11-19 17:37:44 · 2 answers · asked by Anonymous

A car dealer is preparing to sell 100 cars on an auction day. He sets the price for a SUV for $1250 and a Matrix for $850, how many cars of each type should the dealer stock in order to get the greatest profit at the end of the day?

2007-11-19 17:30:40 · 3 answers · asked by Anonymous

Suppose the total cost (in dollars) of manufacturing x units of a certain commodity is
C(x)=3x^2+16x+300
At what level of production is the average cost per unit the smallest. ___________________.
At what level of production is the average cost per unit equal to the marginal cost. ________________

2007-11-19 17:22:16 · 3 answers · asked by Ksyha 1

2007-11-19 17:17:10 · 1 answers · asked by Anonymous

For ex, would this be absolutely convergent or divergent
inf
E (-1)^(n-1) ((5n^2+2) / (4n))
n=1

2007-11-19 17:03:35 · 2 answers · asked by swt16 1