TutorMe homepage

SIGN IN

Start Free Trial

Luan H.

Graduate Student at UTHealth School of Dentistry

Tutor Satisfaction Guarantee

Pre-Calculus

TutorMe

Question:

Express the equation x^2 = 4y in polar coordinates.

Luan H.

Answer:

Step 1: Remind yourself of the formula x = rcosθ and y = rsinθ. Step 2: Rewrite the given equation and replace x by rcosθ and y by rsinθ x^2 = 4y (rcosθ)^2 = 4(rsin θ) Step 3: Calculate r r^2 (cosθ)^2 = 4rsinθ r = 4 sinθ (cosθ)^2 = 4 secθ tanθ

Chemistry

TutorMe

Question:

Find the empirical formula for the oxide that contains 42.05 g of nitrogen and 95.95 g of oxygen.

Luan H.

Answer:

It is really important to convert all the given amount into moles. The ratio of the moles of each element will provide the ratio of the atoms of each element. Step 1: Convert the mass of each element to moles of each element using the atomic masses. (42.05 g N) (1 mol/ 14.01 g N) = 3.001 mol N (95.95 g O) (1 mol/ 16.00 g O) = 5.997 mol O Step 2: Find the ratio or the moles of each element by dividing the number of moles of each by the smallest number of moles. The moles of nitrogen is the fewest. So we will divide each of the mole above by 3.001 (3.001 mol N/ 3.001) = 1 mol N (5.997 mol O/ 3.001) = 1.998 mol O Step 3: Use the mole ratio to write the empirical formula. Since there cannot be partial atoms in the empirical formula, the mole ratios must be whole numbers. 1.998 is sufficiently close to 2 that we can round. Thus the empirical formula is: NO2

Algebra

TutorMe

Question:

Solve the equation 5(3x + 6) - (x + 3) = -4(4x + 5) + 13

Luan H.

Answer:

Step 1: Distribution 15x + 30 - x - 3 = -16x -20 +13 Step 2: Grouping x-term and non x-term (15x - x) + (30-3) = -16x + (13-20) -> 14x + 27 = -16x - 7 Step 3: Eliminate x-term on one side (I choose the right side) and eliminate the constant number on the other side( so it has to be the right side). Add 16x on both side to eliminate x-term on the right side. Add -27 on both side to eliminate the constant number on the left side. 14x + 27 + (16x - 27) = -16x -7 + (16x - 27) Step 4: Calculate all the term from each side 30x = -34 Step 5: Find x by dividing both side to 30 30x/30 = -34/30 -> x = -34/30 -> simplification x = -17/15

Send a message explaining your

needs and Luan will reply soon.

needs and Luan will reply soon.

Contact Luan

Ready now? Request a lesson.

Start Session

FAQs

What is a lesson?

A lesson is virtual lesson space on our platform where you and a tutor can communicate.
You'll have the option to communicate using video/audio as well as text chat.
You can also upload documents, edit papers in real time and use our cutting-edge virtual whiteboard.

How do I begin a lesson?

If the tutor is currently online, you can click the "Start Session" button above.
If they are offline, you can always send them a message to schedule a lesson.

Who are TutorMe tutors?

Many of our tutors are current college students or recent graduates of top-tier universities
like MIT, Harvard and USC.
TutorMe has thousands of top-quality tutors available to work with you.

Made in California

© 2018 TutorMe.com, Inc.