Solution Percents

How many liters of a 30% alcohol solution must be mixed with 90 liters of a 90% solution to get a 70% solution?

10/29/15

Find the domain & range of the following function:

Find the domain & range of the following function:y = 2(3^ x - 1)

A model builder wants to design a scale model of a 51

A model builder wants to design a scale model of a 51 foot air plane so that the length of the model will 8 1/2 inches. the length of the model will be what fraction of the length of the actual... more

10/28/15

susan is 5 years older than her sister. the sum of thier ages is 51. define a variable.

 susan is 5 years older than her sister. the sum of thier ages is 51. define a variable

10/28/15

how long it takes the apprentice working alone to do the job?

A roofer requires 12 h to shingle a roof. After the roofer and an apprentice work on a roof for 8 h, the roofer moves on to another job. The apprentice requires 14 more hours to finish the job. How... more

10/28/15

kilograms of rice

you purchase 2 1/2 kilo gram of rice how many cups of rice do you have if 1 cup weighs 8 ounces?  

The sum of two numbers is 57 and the difference is 7. What are the numbers?

 The sum of two numbers is 57 and the difference is 7. What are the numbers? What is the large #? What is the smaller#?

10/28/15

eight years ago, cindy was twice as old as sally. right now, cindy is 5 years older then sally. find their current ages.

i have no idea how to even begin starting this problem

10/28/15

A total of $54,000 were deposited in three accounts

A total of $54,000 were deposited in three accounts. The first account grew by 4.5%, the second by 7%, the third by 15%. Total earnings were $4,275.00. The earning from the third account were $75... more

10/24/15

Plane speed

Two planes which are 2660 miles apart, fly towards each other.  Their speeds differ by 65 mph.  If they pass each other in 4 hours, what is the speed of each?

10/24/15

Simplify the problem

6 + square root 27/6

10/24/15

Interest rates

The annual interest on a $9000 investment exceeds the interest earned on a $6000 investment by $135. The $9000 is invested at a 0.5% higher rate of interest than the $6000. What is the interest... more

how do I add grouping symbols to 15/3+2-1+1 so that it equals 1?

 How do I add grouping symbols to 15/3+2-1+1 so that it is equal to 1??

09/15/15

If f(x)=x^3-2x find f'(x)

Please help me 

09/14/15

What is his average speed?

Jack drives at 40 mph for an hour, then at 50 mph for an hour.

Please answer this word problem! With solutions and explanation would be very much appreciated. Thank you!

The height of a box is twice its length. The length of this box is twice its width. If each dimension is increased by 1 inch, the volume is increased by 71 square inches. Find the dimensions of the... more

Please answer this word problem! With solutions and explanation would be very much appreciated. Thank you!

A car travels 90 kilometers one hour faster than it takes a slower car to cover the same distance. The speed of the faster car is 24 kilometers per hour more than the speed of the slower car. How... more

5 times the difference of a number and 7 is equal to -25

5 times the difference of a number and 7 is equal to -25

5 times the difference of a number and 7 is equal to -25

5 times the difference of a number and 7 is equal to -25

09/13/15

how much money was invested in the CD account

a mother wants to invest 14,000.00 for her sons future education.She invesst a portion of the money in a bank certificateof deposite (CD account) witch earns 4% and the remainder in a savings bond... more

09/13/15

Of the 131 students at a small private school, 42 are freshman. What fraction of the students are freshman?

a. How  many students are not freshman? B.what fraction of the students are not freshman?

09/13/15

Factor with steps y^5-y^4+y^3-y^2+y-1

Factor fully with steps   
1 2 3 4 6 8 9

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