8th Grade Math!!! Please Help Me It's Due!!!
Graded Assignment
Unit Test, Part 2: Number Properties
Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit.
Total score: ____ of 15 points
(Score for Question 1: ___ of 4 points)
1. Refer to Expression 1 and Expression 2.
Expression 1
Expression 2
(a) What is the value of Expression 1?
(b) Insert parentheses in Expression 2 so that it has a value of 19. Then show why your expression has a value of 19.
Answer:
(Score for Question 2: ___ of 3 points)
2. The average distance from the sun to the planet Mercury is about 58,000,000 km. The diameter of a human hair is about 0.0025 cm.
(a) What is the distance from the sun to Mercury written in scientific notation?
(b) What is the diameter of a human hair written in scientific notation?
(c) In comparing the measurements in Parts (a) and (b), what else must be done before a comparison is made?
Answer:
(Score for Question 3: ___ of 8 points)
3. The population of Columbus, Ohio, in 2014 was about 823,000. The population of the United States was about 319 million in 2014.
(a) Write each population in scientific notation.
(b) About how many times larger was the population of the United States than the population of Columbus, Ohio? Show your work.
Answer:
Answers
3a.8230^2 for Ohio and 3190^5 for us
3b.subtract both for the answer
Answer:I'll answer the questions in step by step.
Step-by-step explanation:
1) expression 1: according to bodmas rules if you evaluate the expression you will get the answer in your expression as follows
39 -> 22 -> 3
expression 2: for getting a value of 19 out of combined expression the parenthesis should be put as
5+(4*2)+(6-2) +(2*1)
If you follow bodmas rules and operate the operands inside brackets then the value will be 19.
2) distance from sun to mercury in scientific notation will be 5.8*10^7
Radius of hair will be: 2.5*10^-3
For comparison we have to check the powers of the indexes. For example here, radius of hair is smaller because -3 is lesser value than 7
3) Ohio population 8.23*10^5
USA population 3.19*10^8
This comparison gives 10^8/10^5
Hence USA population is 10^3 times more