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4 years ago

Weekly homework sheet Q1:5

Mathematics

2 answers:

mote1985 [20]4 years ago

7 0

Take a picture of the worksheet or write it down

cestrela7 [59]4 years ago

5 0

Whare is it at work sheet

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i need help with the last two. I forgot the formula and wondering if you will help me find which one is and isnt a triangle

Nimfa-mama [501]

Answer:

3. D) 26, 7, 31

4. B) 6, 34, 27

Step-by-step explanation:

Both #3 and #4 use the same strategy: the two shorter sides' sum has to be greater than the longer side.

#3:

2 + 8 is 10, which is less than 13. So A wouldn't form a triangle.

12 + 22 is 34, which is the length of the longer side. So B wouldn't form a triangle either.

14 + 18 is 32, which is less than 40. So C wouldn't form a triangle.

7 + 26 is 33, which is greater than 31. So D would form a triangle.

D. 26, 7, and 31 are the only lengths of the ones shown that form a triangle.

#4:

17 + 18 is 35, which is greater than 19. So A would form a triangle.

11 + 22 is 33, which is greater than 25. So C would also form a triangle.

5 + 18 is 23, which is greater than 20. So D would form a triangle.

6 + 27 is 33, which is less than 34. So B wouldn't form a triangle.

B. 6, 34, and 27 are the only lengths of the ones shown that don't form a triangle.

6 0

3 years ago

sarah can complete a project in 90 minutes and her sister betty can complete it in 120 minutes if they both work on the project

alukav5142 [94]

Answer:

It will take them approximately 51.43 minutes to complete the project together

Step-by-step explanation:

This is what is called a "shared job" problem.

The best way to work on them is to start by finding the "portion" of the job done by each of the people in the unit of time.

So, for example, Sarah completes the project in 90 minutes, so in the unit of time (that is 1 minute) she completed 1/90 of the total project

Betty completes the project in 120 minutes, so in the unit of time (1 minute) she completes 1/120 of the total project.

We don't know how long it would take for them to complete the project when working together, so we call that time "x" (our unknown).

Now, when they work together completing the entire job in x minutes, in the unit of time they would have done 1/x of the total project.

In the unite of time, the fraction of the job done together (1/x) should equal the fraction of the job done by Sarah (1/90) plus the fraction of the job done by Betty. This in mathematical form becomes:

$\frac{1}{x} =\frac{1}{90} +\frac{1}{120}\\\frac{1}{x} =\frac{4}{360} +\frac{3}{360}\\\frac{1}{x} =\frac{7}{360} \\x=\frac{360}{7} \\x=51.43\,\,min$

So it will take them approximately 51.43 minutes to complete the project together.

8 0

4 years ago

What is the expanded form of .039

Nikitich [7]

Answer:

0.039

Step-by-step explanation:

Expanded Notation Form:

0.039 =

+ 0.0

+ 0.03

+ 0.009

Expanded Factors Form:

0.039 =

0 × 1

+ 0 × 0.1

+ 3 × 0.01

+ 9 × 0.001

Expanded Exponential Form:

0.039 =

0 × 100

+ 0 × 10-1

+ 3 × 10-2

+ 9 × 10-3

Those are the way you can express .039 in different expanded forms

Hope this helps

4 0

3 years ago

Mark is a professional race car driver. He has competed in 15 races and won 40% of them. How many races has Mark won?

Romashka [77]

Answer:

6 is the answer

Step-by-step explanation:

8 0

4 years ago

Read 2 more answers

Question is in picture below

Ksenya-84 [330]

Answer:

Step-by-step explanation:

4(a+4)-3

4 + 4=8. 8-3=5

8 0

3 years ago