Saturday

August 29, 2015
Total # Posts: 24

**Chemistry **

A galvanic cell is composed of these two half-cells, with the standard reduction potentials shown: Cu2+(aq) + 2 e- ---->Cu(s) +0.34volt Cd2+(aq) + 2 e- ---->Cd(s) -0.40volt What is the standard free energy change for the cell reaction of this galvanic cell?
*April 16, 2015*

**Algebra**

If a quadratic equation with real coefficients has a discriminant of 225, the what type of roots does it have?
*March 26, 2015*

**Maths Percentage**

After spending 30% of his money, John had $140 left. How much did he have at first. Siti and Ali saved $4500. Ali and Jim saved $2950. Siti saved thrice as much as Jim. How much did Ali save? At a concert, there were 15 more children than adults. Each child paid $5 each and ...
*February 11, 2013*

**Maths**

Machine X can pack 3 crates of bottles and Machine Y can pack 4 crates of bottles within the same time. In half an hour, Machine X packs 24 crates. How many crates can 12 Machine Y s pack in 1 hour?
*February 6, 2013*

**Maths**

Su Mei bought 3 apples for $2n. How much did she have to pay for 18 apples?
*February 6, 2013*

**math i don't get it**

I don't get it
*December 17, 2012*

**Maths**

Thanks
*October 4, 2012*

**Maths**

CORRECTION. The selling price of a pencil box was $4. Chee Keong bought the pencil box and paid $4.28 including GST. What percentage of the selling price was the GST?
*October 4, 2012*

**Maths**

Rahyu spent 2h 25 min in a library. She spent 30 min of the time reading newspapers. What percentage of her time in the library was spent reading newspapers? Round off your answer to the nearest whole number.
*October 4, 2012*

**Maths**

Mr Srinivasan invests $55 000 in a fixed deposit account. The interest rate is 3.3 % per year. How much money will he have in the account after 1 year?
*October 4, 2012*

**Maths**

lol sorry :/
*October 4, 2012*

**Maths**

The selling price of a pencil box was $4. Chee Keong bought the pencil box and paid $4.28 including GST. What percentage of milk was left?
*October 4, 2012*

**Maths**

A jug contained 780 ml of mil. Mrs Li poured 221 ml of the milk into a glass and 130 ml into a cup. What percentage of milk was left in the jug?
*October 4, 2012*

**Maths**

Evelyn has a ribbon 420 cm long. She uses 216 cm to decorate a present., What percentage of ribbon is left> Express your answer correct to 1 decimal place.
*October 4, 2012*

**Maths**

A sum of money is shared between Alice, Gayah and Sita in the ratio 3:2:4. If Gayah receives $4287.50, how much money do Alice and Sita receive altogether?
*October 1, 2012*

**Maths**

There were 3 glasses containing the same volume of liquid. Mr Lee poured 210 ml of the liquid from Glass A into Glass C, and 150 ml of the liquid from Glass B into Glass C. In the end, the ratio of the volume of liquid in Glass A to the volume of liquid in Glass B was 3:8. A...
*September 30, 2012*

**Maths**

Tina and Gopal had some stickers in the ratio 2:3. Gopal gave half of his stickers away and the ratio became 4:3. If Gopal had given away 21 stickers, how many stickers did each person have at first?
*September 30, 2012*

**Maths**

The ratio of the number of coins Azam had to the number of coins Eddie had was 3:7. Eddie gave 42 coins to Azam and they ended up having the same number of coins. How many coins did each person have at first?
*September 30, 2012*

**Maths **

The ratio of the amount of money Karen had to the amount of money Peter had was 2:5. Peter received $75 from his mother, the ratio became 4:15. How much money did each person have at first?
*September 30, 2012*

**Maths**

Sam used cement and sand to prepare a mixture. The ratio of the number of pails of cement used to the number of pails of sand used was 1:2. Sam then added 8 more pails of cement and the ratio became 5:2. A.) How many pails of cement was used at first? B.) How many pails of ...
*September 30, 2012*

**Maths**

The ratio of the volume of water in Jug A to the volume of water in Jug B is 2:5. A.) If half of the water in Jug A is poured into Jug B, what is the new ratio of the volumes of water in Jug A to Jug B? B.) If half of the water in Jug B is poured into Jug A, what is the new ...
*September 30, 2012*

**Trigonometry**

A standard doorway measures 6 feet 8 inches by 3 feet. What is the largest dimension that will fit through the doorway without bending?
*April 16, 2012*

**maths, economics, game theory**

1. What is a degenerate game? 2. Is the following game degenerate or not, justify. 3. Find all nash equilibria in the game in pure or mixed strategies a b c d T 4,5 1,4 2,0 1,2 B 6,0 0,1 1,3 0,2
*February 23, 2011*

**algebra with pizazz pg 40 riddle**

8(4u-1)-12u=11(2u-6)
*September 26, 2010*

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