Enable contrast version

Tutor profile: Maryann T.

Inactive
Maryann T.
Teacher for 7 years
Tutor Satisfaction Guarantee

Questions

Subject: Pre-Algebra

TutorMe
Question:

Evaluate 3x^{2}+7xy+4y^{3}, when: 1. x = 4 and y= 5 2. x = -1 and y=2

Inactive
Maryann T.
Answer:

Evaluating algebraic expressions simply means to determine the value of the expression for a given value of each variable in the expression. Replace each variable in the equation with the given value, then use the order of operations to simplify the resulting expression. 1. x = 4 and y = 5 a. Substitute the value of x and y = 3(4^{2})+7(4)(5)+4(5^{3}) b. Simplify. =3(16)+7(20)+4(125) c. Combine the numbers by applying the rules in adding integers. = 48+140+500 Answer: 688 2. x = -1 and y=2 a. Substitute the value of x and y = 3(-1)^{2}+7(-1)(2)+4(2^{3}) b. Simplify. =3(1)+7(-2)+4(8) c. Combine similar terms by applying the rules in adding/subtracting integers = 3-14+28 = 31-14 Answer: 17

Subject: Basic Math

TutorMe
Question:

Are the zeros in the number 4.280094 significant? If so, how many significant figures does it have?

Inactive
Maryann T.
Answer:

According to the rules of significant numbers, all the zeroes between any two non-zero digits are significant. This condition is satisfied by the 0 between 8 and 9. Also, in a number with a decimal point, all the terminal zeroes are significant. As a result, both zeros in the provided number are significant.

Subject: Statistics

TutorMe
Question:

A group of students will conduct a poll to find out what residents of a specific town think about the price spike on basic goods during the pandemic. What should the sample size be if the community has 10,000 residents and the students aim to use a sample with a 10% margin of error?

Inactive
Maryann T.
Answer:

Here the population size (N) is 10000 and the margin of error (e) is 10% or 0.10. Substituting the given values in the formula n=\frac{N}{1+Ne^{2}}, we have n=\frac{N}{1+Ne^{2}} n=\frac{10000}{1+(10000)(0.10)^{2}} n=\frac{10000}{1+(10000)(0.01)} n=\frac{10000}{1+100} n=\frac{10000}{101} n= 99.01 or 99 As a result, the students' group will only perform the poll with 99 residents. A margin of error of 10% indicates that the student is 90% confident that the result obtained using the sample will closely approach the result obtained using the population.

Contact tutor

Send a message explaining your
needs and MaryAnn will reply soon.
Contact MaryAnn

Request lesson

Ready now? Request a lesson.
Start Lesson

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 Lesson" 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.
BEST IN CLASS SINCE 2015
TutorMe homepage
Made in California by Zovio
© 2013 - 2021 TutorMe, LLC
High Contrast Mode
On
Off