07/20/16

SAT Math Problem (17)
If sin x = 3/5 and cos x < 0, then find tan x. (Note: sin2x + cos2x = 1)
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07/20/16

trigonometry with angle of depression
The angle of depression from the top of a 15 m tree down to a pond is 25c41l. If a bird is perched in the top of the tree, how far does it need to fly to reach the pond, to the nearest metre?
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07/19/16

How much premium gas (92 octane) and regular (87 octane) should be mixed to obtain 50 gallons of mid grade (89 octane?)
 How much premium gas (92 octane) and regular (87 octane) should be mixed to obtain 50 gallons of mid grade (89 octane?)
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07/19/16

SAT Math Problem (14)
If the graph of the equation y = ax2+bx+c passes through the points (0,2), (-6,-70, AND (8,-14), what is the value of a+b+c?
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07/19/16

Jack usually mows his lawn in 44 hours. Marilyn can mow the same yard in 33 hours. How much time would it take for them to mow the lawn? together?
Jack usually mows his lawn in 44 hours. Marilyn can mow the same yard in 33 hours. How much time would it take for them to mow the lawn? together?
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07/19/16

Varies directly as the square
The area of a projected picture on a movie screen varies directly as the square of the distance from the projector to the screen.  If the distance of 20 ft produces a picture with an area of 6 [c]... more
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07/19/16

11 qt radiator is currently full of 30% anti-freeze. It is supposed to be 50%. How much should he drain out and replace with 100%.. continued below
Full story problem.. Bob's 11-quart radiator is currently full of 30% anti-freeze. It is supposed to be 50%. How much should he drain out and replace with 100% anti-freeze to have a full radiator... more
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07/19/16

A distance and time query
A freight train leaves the station at 9am. an amtrak train leaves the same station 6 hours later at 3pm. the freight train travels 70mph slower than the amtrak train. if the amtrak passes the... more
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07/19/16

How much extra-lean hamburger (12% fat) needs to be added to 339 lbs of regular hamburger (27% fat) to make a batch of lean meat (20% fat)??
I am struggling with these mixture problems any help getting the correct formula and answer? Getting desperate 
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07/19/16

What is f(×)=[×]-3 evaluated for ×=-2.8
I don't get what I have to do after I plug in the -2.8 .
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07/19/16

Mixture. A mechanic has 363 gallons of gasoline and 17 gallons of oil to make gas/oil mixtures. He wants one mixture to be 6 % oil and the other mixture to be 2
Mixture. A mechanic has 363 gallons of gasoline and 17 gallons of oil to make gas/oil mixtures. He wants one mixture to be 6 % oil and the other mixture to be 2.5 % oil. If he wants to use all of... more
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07/19/16

Three of four numbers have a sum of 22. If the average of the four numbers is 8, what is the fourth number? A. 4 B. 6 C. 8 D. 10
 Please show your work.  
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07/19/16

Word Problem
The chances of the Oilers defeating the Rams next week are 5 in 8. What are the chances that the Ramswill beat the Oilers? (Write your answer as a percent.)[A] 37.5% [B] 3.75% [C] 160% [D] 6.25%
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07/18/16

Distance, rate ,time
You and a friend both live the same distance from a coffee shop. You walk at a rate that is one Mike an hour faster than your friend. If your friend leaves his house at 6:30 am and you leave your... more
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07/18/16

Word Problem (intermediate Algebra)
How far above the water would a submarine periscope have to be above the water to locate a ship 2.3 mi away? The equation for the distance in miles that the lookout can see is d = 1.5h, where h is... more
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07/18/16

Will is 21%taller than Wanda, therefore wills height is what % of Wanda's
Will is 21%taller than Wanda, therefore wills height is what % of Wanda's
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07/18/16

Determine the cube root of 27(cos(7pi/6)+i sin (7pi/6)).There is more then one answer.
Determine the cube root of 27(cos(7pi/6)+i sin (7pi/6)). There is more then one answer.
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07/18/16

Divide by a binomial
t^2-13/t+4   I can't seem to figure it out. Please help.
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07/18/16

discreet math
Which rule must be used to find out the number of ways one representative can be picked who is either a mathematics major or a computer science major?The division ruleThe sum rule The subtraction... more
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07/18/16

algebra word problems
A box had twice as many grapes as a basket. Once 2 kilograms of grapes were added to the basket, it contained 0.5 kg more than the box. How many kilograms of grapes are in the basket now?
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07/18/16

I need help with a word problem involving algebra
A box had twice as many grapes as a basket. Once two kilograms of grapes were added to the basket, it contained 0.5 kg more than the box. How many kilograms of grapes are in the basket now?
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07/18/16

Graphing a logarithmlog
y=(log3X) -1    When finding the table of values, I removed the brackets and did 3y =x-1 but ended up with a different set then the one in my book.    Also , if I were to convert y=3^x+1 , its... more
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07/18/16

how to tell if a linear system has one, none, or infinitely many solutions?
I just want to no how to do this without solving the linear system. and maybe graphing?
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07/18/16

A carpenter uses 2/5 of a board for each desktop he makes. If he uses 6 boards completely how many desktops could he make?
Fractions
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07/18/16

SAT Math Problem (12)
Which of the following lines contains all points equidistant from the points (0,4) and (8,0) in the xy-plane?   A. 2y = -x + 8 B. 2y = x C. y = 2x -6 D. y = -2x   I was able to graph this... more
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