# Posts by Louie

Total # Posts: 28

**social studies**

It's answer #2: potential energy. Kinetic energy is the energy that the ball acquires when it's moving.

**Math HELP**

Find the present value of the annuity necessary to fund the withdrawal given. $300 per month for 20 years Annuity earns 7% per year thank you for your time.

**math algebra**

Evaluate the following algebraic expressions for the given value: 1. 4y-115 if y=7 2. 312 + 78x if x=4 3. 8z2 - 9 if z=3

**Trigonometry**

A flagpole 20ft tall cast a shadow 12ft long on the level ground. Find the angle which the rays of the sun make with horizontal

**Math10**

The 4th term of an arithmetic sequence is 18 and the 6th term is 28. Give the first 3 terms. Use the formula

**Pre Algebra, Check my answers?**

You roll a number cube numbered one to six 12 times. P(5) = two over three. What type of probability is illustrated and why? (1 point) experimental; the result is based on the number of possible outcomes ** experimental; the result is found by repeating an experiment ...

**social studies**

For what main purpose did European rulers build empires?

**math**

The weight W that a horizontal beam can support varies inversely as the length L of the beam. Suppose that a 4-m beam can support 1000 kg. How many kilograms can a 17-m beam support?

**Chemistry**

4 mole

**Math**

#3. amortized is if both the principal and interest rate are paid by a sequence of equal periodic payments Amortization Formula: R=monthly payments (?) P= principal amount ($2419.) i= 5.2% interest rate (0.052/36) n = number of payments (36 months) R = P(i) ------- 1-(1+i)^-n ...

**math**

the hundred thousands digit of a six-digit even numbers is 3 more than the thousand digit,which is twice the ones digit.give at least four numbers that satisfy the given condition.

**Math**

give a example of the hundred thousand digit of a six-digit even numbers is 3 more than the thousand digit,which is twice the ones digit.give at least four numbers that satisfy the given condition.

**Math**

give me a example of the hundred thousand digit of six-digit even numbers is 3 more than the thousand digit,which is twice the the ones digit.give at least four numbers that satisfy the given condition.

**Math**

Math - To find 62 - 24, you could first find 64 - 24 = 40. Then what should you ...

**trigonometry**

VERIFY:(1-sinx)/(1+sinx)= sec^2x-2secxtanx+sec^2x-1

**chemistry**

Never mind, I figured it out!

**chemistry**

We used 1g of MgO and .5g of Mg for the experiment. 250ml of 1M HCL was also used.

**chemistry**

I'm trying to figure out what went wrong during my freshman chem lab. We were figuring out the enthalpy of formation of MgO(s). MgO(s) + 2H+(aq) -> Mg2+(aq) + H2O(l) dHrxn = -334.83kJ/mol Mg(s) + 2H+(aq) -> Mg2+(aq) + H2(g) dHxrn = -1105kJ/mol H2(g)+ 1/2O2(g) -> ...

**maths (trig)**

tangent of theta is opposite / adjacent. So your theta (angle) here is 50, your opposite is 27, and we don't know the adjacent. So do simple algebra & bring x to the other side by multiplying so you have tan50 * x = 27, now divide tan50 * x by tan50 to get x by itself. Now...

**maths**

What direction is the bee traveling? Anyways, i don't know...But the trains will collide in exactly 1 hour since the one is going 30 and the other 20. Their distance is 50 km apart. Is it asking if the bee is going 80km/hr, how long will it take to travel 50 km? If so then...

**trigonometry**

^Yeah theta has to be in degrees, or radians. Sq rt of 15 can't be right

**physics**

Use your kinematic equations. You know Vix, Ax, Then you'll need to find Vfx

**Chemistry**

I remember this from last year - you should have a table of the heat of enthalpy somewhere in your book. From this you'll need to get the values of delta H (heat) of each mixture. The left side (HCl + NaOH) is the reaction and the right side is the result - you'll ...

**math**

It was kind of windy the other day bring the temperature from -10 degrees centigrade to 18 degrees centigrade in 24 hours. How much did the temp. rise in 24 hours? on average, how much per hour did the temp. rise?

**Physics**

g=0.02

**history**

what is difference between political and economical?

**socual studies**

what is the second largest exporter of rice

**algebra 2**

Evaluate the expression (40/2+i) + (35/2-i). What steps do I take in order to find this answer?