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3 years ago

Is -115.5 rational or irrational

Mathematics

1 answer:

Lady bird [3.3K]3 years ago

4 0

Answer:

Rational

Step-by-step explanation:

A rational number is a number that can be represented a/b where a and b are integers and b is not equal to 0. It is also rational because it can be represented as a ratio between two numbers which is usually not the case in irrational numbers.

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!!!!!!!!!!!!!!!!!!!!

Andru [333]

Answer:

$f^{-1}(x)=4x+20$

Step-by-step explanation:

Given

$f(x)=\frac{x}{4}-5\\ \\y=\frac{x}{4}-5$

Swap x and y and solve for y

$y=\frac{x}{4}-5\\ \\x=\frac{y}{4}-5\\ \\x+5=\frac{y}{4}\\ \\4(x+5)=y\\\\y=4x+20$

Final answer

$f^{-1}(x)=4x+20$

Keep in mind that we need to swap the variables because a function and its inverse are symmetrical about the line y=x. See the graph below.

3 0

2 years ago

Find the selling price of a $36 item after a 50% markup

agasfer [191]

Answer:

$54

Step-by-step explanation:

36 divided by 2= 18

$36+$18=$54

7 0

1 year ago

Active ingredient of a pill comprises 45% of the pill mass. If a pill contains 325 mg of active ingredient,

uranmaximum [27]

Answer:

Step-by-step explanation:

The idea here is to be able to write and then solve the equation needed for this. In words, this is what you are looking to solve: "The active ingredinet is 45% of the mass of the pill". Putting those words into an equation:

active ingredient = .45 (mass of pill). Since our active ingredient is 35 mg:

325 = .45m and divide by .45:

m = 722.2 mg

6 0

2 years ago

I need help please 25 points for whoever helps me

34kurt

Yuto is correct because he isolated the variable correctly and reversed the inequality symbol.

x < 3

3 0

2 years ago

You have a monthly budget percentage of 5% for marketing your projected sales for the month of March are $300,000 what is the am

fgiga [73]

Answer:

$15,000 is the amount to spend on marketing in the month of March.

Step-by-step explanation:

Given:

You have a monthly budget percentage of 5% for marketing.

Your projected sales for the month of March are $300,000.

Now, to find the amount spend on marketing:

Rate of marketing = 5%.

Projected sales for the month of March = $300,000.

Now, to get the amount spend on marketing in March:

5% of $300,000.

$=\frac{5}{100} \times 300,000$

$=0.05\times 300,000$

$=15,000.$

Therefore, $15,000 is the amount to spend on marketing in the month of March.

7 0

2 years ago