01/22/15

litmus paper

when using litmus paper, if you dip a blue strip into a base what color will it turn?  

01/20/15

Chemistry HELP!

An office heater puts out 2010 Btus (British thermal units) of energy in the form of heat per hour. Given that 1 Btu =1.055 kJ, how many megajoules of energy in the form of heat can be produced per... more

Algebra 1 problem

Solve completly. Please show work: 18y^2 + 8 = 24y

solve x^2+2x-3=0 by completing the square

x^2 +2x -3 =0     solve by completing the square and then by quadratic formula

01/14/15

1 day I owed $3.00, 2 days $4.50, 3 days $6.00, 4 days $7.50, what is the equation that models the amount of money I owed after "x" days?

1 day I owed $3.00, 2 days $4.50, 3 days $6.00, 4 days $7.50, what is the equation that models the amount of money I owed after "x" days?

01/14/15

write an expression in simplest form that represents the income from w women and m men getting a hair cut and shampoo.

Women: $45 in hair cuts, $12 in shampoos. Men: $15 in hair cuts and $7 in shampoos.

01/14/15

Some cells divided once every 20 min. At this rate how many cells would be there 1 hour, 2 hours, and 3 hours,after a single cell began mitosis

Some cells divided once every 20 min. At this rate how many cells would be there 1 hour, 2 hours, and 3 hours,after a single cell began mitosis?

01/06/15

What is the slope and y-intercept for y = 7/9× - 3 1/3.

More stuff about slopes 

01/05/15

what is the pOH of a solution with a [OH-] concentration of 9.7x10(-11) M

what is the pOH of a solution with a [OH-] concentration of 9.7x10-11    M?

Please! Help!

how do you convert mm to centimetres?...

Denise's car gets 21 miles a gallon. she drives 48 miles everyday $2.64 per gallon. How much will Denise spend on gas for a five day work week?

Denise car gets 21 miles per gallon. Gas costs $2.64 per gallon. She drives 48 miles everyday to and from work. How much will Denise spend on gas for a five day workweek?

01/04/15

please help me!!

Sarah, Lacey, and Mark stuffed envelopes with invitations for parents to an open house.• Sarah stuffed 10 more envelopes than Lacey.• Mark stuffed 3 less than twice as many envelopes as Lacey.•... more

01/04/15

whats the inverse of the function of y= 3x2 -2x +1

3x2 -2x +1

01/04/15

graph word problems

Andy and Devon are comparing the international calling plans on their cell phones. On his plan, Andy pays $3 just to place a call and $3 for each minute. When Devon makes an international call, she... more

Help!!!!!!!!

 2a-3b-3c=-7 -4a-6b+2c=18 -2a-3b+2c=14 

A circle has the equation x2+y2-8x+14y+40=0. Express this equation in center-radius form.

Homework problem I can't figure out, there's two of these problems they're very similar but if someone can explain it to me step by step I think I can figure out the second one on my... more

01/04/15

What is the equation of the line through( 3,3) that is perpendicular to the line y=-1/2x+2?

Is there any easy way to solving this problem?

01/04/15

factor the expression -216x^3+1

factor the expression -216x^3+1

01/01/15

Real-life Calculus: Maximum Volume

The surface area is 337.5 of a box with a square base. I am using S = x2 + 4xh = 337.5 then I get  (337.5 - x2)/4x So V = x2(337.5 - x^2)/(4x) After finding f'(x) = 84.375 - (3x2)/(4) and a... more

12/31/14

How many centimeters are in 6.405 kilometers?

Just the question

I need help, can anyone answer this?

The total profit in thousands of dollars from the sale of x thousand units of a new arthritis drug is give by the function: f(x)= -x^3+7.5x^2+72x. How many units should be sold to maximize the... more

12/27/14

15. w= y+z/3 ;z 16. 6x+7y=12 ;y

solve each formula in terms of the given variable.

12/27/14

Tickets for the high school musical are $5.50 for adults and $3.75 for students. How many adults bought tickets if 525 student tickets are sold and the total

and the total money collected is $3772.7? Define a variable and write an equation to model each situation. Then Solve.

12/21/14

3 wks ago company had 250 clocks in inventory, 2 wks from now it will have 500 - what is the expression for it

3 weeks ago a company had 250 clocks in inventory.  2 weeks from now it will have 500.  I need an algabraic equation for this using the Y=mx+b to determine the y intercept and the y2-y1, x2-x1... more

Doctor's order.

A doctor has ordered 325 mg of atropine. The drug is available as a solution that contains .50 g of atropine per mL. How many mL of the solution would the patient need ?   I have (325 mg)/(.50ml)... more

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