# Posts by Lizette

Total # Posts: 17

Chemistry
The answer to E is 1

math
john and james are among 30 students who have applied for a trip to boy's state. two students from the group will be selected at random from the trip. what is the probability that john and james will be the 2 students selected?

Chemistry
dilute the concentration of 100mL of KIO3 from 0.5M to 0.0005M

math
whats is the radius of 7.5 by the square root of 11 plus or minus 3 ?

math
How can you decide whether a photo or drawing can be enlarged or reduced to fit a space without distorting the shape?

math
Darius uses the shadow method to estimate the height of a flagpole. He finds that a 5 foot stick casts a 4 foot shadow. At the same time he finds that the flagpole casts a 20 foot shadow. Make sketch. Use Darius's measurements to estimate the height of the flagpole. Thanks...

Pre-Calc
Use the fundamental identities and appropriate algebraic operations to simplify the expression. cosx / (1+sinx) Answer: secx Can someone please assist as to how I get to the answer?

Economics
I am doing an assignment where I am starting up a Food Van where I sell burgers. What would be some implicit costs? Also, what would be some variable costs? Thanks.

Economics
Today's supply curve of classrooms on campus is likely to have a price elasticity of: less than one equal to one greater than one Can anyone please assist? Thanks

Economics
Today's supply curve of classrooms on campus is likely to have a price elasticity of: less than one equal to one greater than one Can anyone please assist? Thanks

Finance
Ezzel Corporation issued perpetual preferred stock with a 10% annual dividend. The stock currently yields 8% and its par value id \$1000. What is the stock's value?

Algebra1
Marcy has a total of 100 dimes and quarters. If the total value of coins is \$14.05, how many quarters does she have?-It has to be in algebra form.

science
Calculate the resistance in a circuit in which a 9-volt battery produces 3 amperes. A)3 ohms B)6 ohms C)9 ohms D)27 ohms

science
there are three sources of resistance in a parallel ciruit. Two of them are rated at 20ohms, the other at ohms. What is the curuit's total resistance? A)20 ohms B)12 ohms C)8 ohms D)5 ohms

science
four 9-volt barreries are connected in parallel. How much voltage is active across the circuit?

Chem
Acetic acid is 3% dissociated in a 0.02M solution. Give the concentrations of each of the two ions, the acetic acid, and the Ka for acetic acid. HC2H3O2 ==> H^+ + C2H3O2^- So (H^+) = 0.02*0.003 = ?? (C2H3O2^-) = 0.02*0.003 = ?? Plug into Ka expression and solve for Ka. Post...

Algebra 1
Hi!