# Posts by pip

Total # Posts: 12

**Trig**

Two rays with common endpoint O form a 30 degree angle. Point A lies on one ray, point B on the other ray, and AB=1. What is the maximum possible length of OB?

**Precalc**

Screenshot of my solution here (get rid of all spaces and the url should work): lh3. googleusercontent. com/-Tpu8S83BSbc/Vy1oGcAFEiI/AAAAAAAAD-Q/LDg0yszPVOcN8pWYNyH11rLstx00HpSKQCK8B/s512/2016-05-06. png Can someone check it please?

**Precalc**

Oh wait, I think I'm onto something and might have the solution! (Hopefully it's right... I think I'll post it on here when I'm done for confirmation)

**Precalc**

Let x, y, and z be real numbers such that cos(x) + cos(y) + cos(z) = sin(x) + sin(y) + sin(z) = 0. Prove that cos(2x) + cos(2y) + cos(2z) = sin(2x) + sin(2y) + sin(2z) = 0.

**Physics**

A plane flies at 220 km/h toward the south as observed by a person on the ground. The airplane pilot measures an air velocity of 2.8 x 105 m/h south. What is the velocity of the wind that affects the plane?

**Algebra**

Paul charges people $25 to test the air quality in their homes. The device he uses to test air quality cost him $500. a.) Write an equation that describes Paul's net profit as a function of the number of clients he gets. b.) How many clients does he need to break-even (...

**math/algebra**

350

**Grade 12 Math Please help!!**

I am stuck on this as well

**chemistry**

1.70

**chemistry**

In the following reaction, how many liters of carbon dioxide, CO2, measured at STP, would be produced from the decomposition of 143 g of magnesium carbonate, MgCO3? MgCO3---MgO+CO2

**CHEMISTRY**

Silver reacts with nitric acid to form nitrogen monoxide, silver nitrate and water. Calculate the volume of nitrogen monoxide gas (@STP) that can be produced from the reaction of 5.00g of silver?

**chemistry**

A helium balloon contains 0.26 g of helium. How many moles of helium does it contain?

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