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2 years ago

What is the value of x????

Mathematics

1 answer:

Arte-miy333 [17]2 years ago

4 0

Answer:

Step-by-step explanation:

${18}^{2} = {x}^{2} + {x}^{2} \\ \frac{18 \times 18}{2} = {x}^{2} \\ x = \sqrt{9 \times 18} \\ x = \sqrt{9 \times 9 \times 2} \\ x = 9 \sqrt{2}$

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Element X is a radioactive isotope such that every 26 years, its mass decreases by half. Given that the initial mass of a sample

SSSSS [86.1K]

Answer:

It will take 15.029 years for element X to reach mass of 260 grams

Step-by-step explanation:

The half life period of radioactive element X is 26 years

The initial mass of radioactive element X is 260 grams

Elapsed time = half life * log (beginning amount /ending amount)/log 2

Substituting the given values, we get

Elapsed time = 26 * log (390/260)/log 2

= 15.209 years

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2 years ago

A box of baseball cards is $25.00 with %15 off. What is the sale price of the box of cards? In other words, how much is it after

yan [13]

Answer:

21.25

Step-by-step explanation:

you would multiply 25 by 0.15 to get the percent being taken off then subtract that from your original price

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3 years ago

A line has a slope of zero

asambeis [7]

Answer:

Horizontal Line

Step-by-step explanation:

Easy the line has the same Y all throughout it

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2 years ago

On Monday 4 bricklayers took 3 hours to lay a total of 4200 bricks.

lisabon 2012 [21]

<h2>Hello!</h2>

The answer is:

It will take 4.5 hours for two bricklayers to lay a total of 3150 bricks.

From the statement, we know that on Monday, bricklayers took 3 hours to lay a total of 4200 bricks.

So, we have that the rate of the four bricklayers is given by the following equation:

$Production=Rate*Time\\\\Rate=\frac{Production}{time}$

$Rate=\frac{4200bricks}{3hours}=\frac{1400bricks}{hour}$

Therefore, we have that the rate of the four bricklayers is 1400 bricks per hour, meaning that each bricklayer can lay 350 bricks per hour.

Now, to calculate how many hours it will take to the 2 bricklayers to lay a total of 3150, we need to divide the calculated rate (for bricklayers) by two, since there are only 2 bricklayers working on Tuesday.

So, calculating the time, we have:

$Production=\frac{Rate}{2}*Time$

$3150bricks=\frac{\frac{1400bricks}{hour}}{2}*Time$

$3150bricks*2*\frac{1hour}{1400bricks}=Time$

$6300bricks*\frac{1hour}{1400bricks}=Time$

$Time=4.5hours$

Hence, we have that it will take 4.5 hours for two bricklayers to lay a total of 3150 bricks.

Have a nice day!

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2 years ago

If a trucker changes the oil every 10,000 miles, and he starts the year with a fresh oil change, how many times will he change t

Wittaler [7]

he will change his oil 16 times because 160,000 divided by 10,000 equals 16

8 0

2 years ago

Read 2 more answers