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4 years ago

-2√7 rational or irrational?

Mathematics

2 answers:

IgorLugansk [536]4 years ago

3 0

The sqrt(7) part makes it irrational, so the answer is irrational.

Pani-rosa [81]4 years ago

3 0

Answer

$-2\sqrt 7$ $\text {is an irrational number}$

Explanation

$-2\sqrt 7$ is an irrational number, an irrational number is a number that contains repeating decimals or that cannot be written as a simple fraction.

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5 grams of chucknorrisidium created, decays at a half-life of 16,000,000 Need 1 gram for experiments. How long before the is 1 g

devlian [24]

Answer:

the time taken for the element to remain 1 gram is 38,400,000 unit.

Step-by-step explanation:

Given;

initial mass, m = 5 g

half life, t = 16,000,000 unit

The time taken for the element to remain 1 gram is calculated as;

mass remaining time

5 g 0

2.5 g 16,000,000

1.25 g 32,000,000

0.625 g 48,000,000

Interpolate to obtain the time at 1 gram;

1.25 g ---------------------------------- 32,000,000

1 g --------------------------------------------- x

0.625 g --------------------------------------- 48,000,000

$\frac{1.25 - 1}{1.25 - 0.625} = \frac{32,000,000 - x}{32,000,000 - 48,000,000} \\\\\frac{0.25}{0.625} = \frac{32,000,000 - x}{-16,000,000} \\\\-4,000,000= 20,000,000 - 0.625x\\\\0.625x = 20,000,000 + 4,000,000\\\\0.625x = 24,000,000\\\\x = \frac{24,000,000}{0.625} \\\\x = 38,400,000$

Therefore, the time taken for the element to remain 1 gram is 38,400,000 unit.

8 0

3 years ago

Can someone help me with this

elena-s [515]

Answer:

3^14

Step-by-step explanation:

Taking a look at the question, try to break it down into these general steps:

1. Identify the base number. Are they the same? In this case, the base number is 3 so they are the same.

2. Recall the rules when multiplying exponents. In this case, multiplying exponents across will end up being 9+5.

3. Rewrite the equation as 3^(9+5). This should give you 3^14

3 0

2 years ago

Answer the question and make sure it is squared and in meters please i need help

Readme [11.4K]

Answer:

10,000 square meters.

Step-by-step explanation:

First, let's split this shape into a rectangle and a triangle to make it easier.

Rectangle:

A = bh

We know the base is 120m and the height is 30m. So simply plug those into the equation.

A = (120)(30) = 3,600 square meters.

Triangle:

A = 1/2bh

Since we split the shape up, we have to calculate the triangles base and height.

To find the base, take the 120 and subtract the 40, giving us 80.

To find the height, take the 190 and subtract the 30, giving us 160.

Now take those numbers and plug them into the equation.

A = 1/2(80)(160) = 1/2(12,800) = 6,400 square meters.

Total:

Simply add the area of the rectangle to the area of the triangle to find the area of the entire shape.

A = 3,600 + 6,400 = 10,000 square meters.

3 0

3 years ago

Select ONE of these problems to solve. STAR the problem and then write the expression first. After you write the expression, sol

Gwar [14]

An expression that represents the total calories for ‘n’ Big Macs is:
550n
Use the expression to solve the total calories in 17 Big Macs:
550(17) = 9350

THEREFORE, there are 9350 calories in 17 Big Macs.

6 0

2 years ago

Read 2 more answers

17. Find the length of the midsegment XY.

fredd [130]

Xy = 12 because if you look at the pattern the top one is 16 and the bottom one is 8 so the middle of those would be 12.

4 0

3 years ago