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3 years ago

Find each sum or difference (5a+9b)-(4b+2a)

Mathematics

1 answer:

valentinak56 [21]3 years ago

3 0

Answer:3a + 5b

Step-by-step explanation:

(5a+9b)-(4b+2a)

Open brackets

5a+9b-4b-2a

Collect like terms

5a-2a+9b-4b

3a+5b

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4 years ago

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during his first year as a pilot, rob flies 6,692 miles. he flies 16,429 miles the second year and 24,211 miles the third year.

emmainna [20.7K]

First years flies = 6,692 miles ≈7000 miles.

Second year flies = 16,429 miles ≈ 16000.

Third year flies = 24,211 miles ≈ 24000

Total number of miles flies in first and second year = 7,000miles +16,000 miles

Number of more miles he flew in the third year than the first and second year combined = Number of miles flies in third year - Total number of miles flies in first and second year

Number of more miles he flew in the third year than the first and second year combined 24,000 - (7,000+16,000)

Therefore, 24,000 - (7,000+16,000) estimation of how many more miles he flew in the third year than the first and second year combined.

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3 years ago

Your time spent playing pool and ice skating must not exceed 20 hours a week. Your weekly allowance is $80. You pay $3 an hour p

Anton [14]

Answer:

The graph in the attached figure

Two possible solutions are the point (10,10) and the point (4,8)

see the explanation

Step-by-step explanation:

Let

x ----> the time in hours spent playing pool in a week

y ----> the time in hours spent for ice skating in a week

we know that

$x+y \leq 20$ ----> inequality A

$3x+5y \leq 80$ -----> inequality B

using a graphing tool

The solution is the shaded area

see the attached figure

Remember that the time can not be a negative number

If a ordered pair is a solution of the system of inequalities, then the ordered par must lie on the shaded area of the solution

Looking at the graph

Two possible solutions are

(10,10) ----> this point lie on the shaded area of solution

That means -----> The time in hours spent playing pool in a week is 10 and the time in hours spent for ice skating in a week is 10

(4,8) ----> this point lie on the shaded area of solution

That means -----> The time in hours spent playing pool in a week is 4 and the time in hours spent for ice skating in a week is 8

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3 years ago

In which expression is the number 3 expressed as the coefficient of a variable

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Answer:

the second one that is 3y+1

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A biologist sets up cameras to record all the animals that come to a watering hole over a 30 day period. This is an example of w

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This is an example of observational study, because the biologist is not interfering or interacting with the subjects of study but just watching and registering data (recording with cameras).

The biologist is not conducting an experiment because (he is not setting up special conditions to register different responses to drive conclusions), and the biologist is not making any survey (questionnaires for example).

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3 years ago