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3 years ago

The area of a square is 144 square feet. What is the length of each of its sides?

Mathematics

1 answer:

Cloud [144]3 years ago

6 0

All you have to do is find the square root of 144. 12 times 12 is 144.

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3 years ago

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Alexus [3.1K]

Option B

The first strain is $2.182 \times 10^{-7}$ mm larger than second strain

Solution:

Given that,

The length of one strain of the bacteria measures 0.000000242 mm

The length of the second strain measures 0.0000000238 mm

To find: Difference between the first strain and second strain

From given ,

Length of first strain = 0.000000242 mm

Length of second strain = 0.0000000238 mm

Let us convert them into scientific notation

Move the decimal point in your number until there is only one non-zero digit to the left of the decimal point. The resulting decimal number is a.

Count how many places you moved the decimal point. This number is b.

If you moved the decimal to the left b is positive.

If you moved the decimal to the right b is negative.

Write your scientific notation number as a x 10^b

Therefore,

$0.000000242 = 2.42 \times 10^{-7}$

[ Here we moved the decimal point to right , we have moved 7 times. So exponent is -7 ]

$0.0000000238 = 2.38 \times 10^{-8}$

[ Here we moved the decimal point to right , we have moved 8 times. So exponent is -8 ]

Now find the difference

$Difference = length\ of\ first\ strain\ - length\ of\ second\ strain$

$Difference = (2.42 \times 10^{-7}) - (2.38 \times 10^{-8})\\\\\text{Make the exponents same }\\\\Difference = (2.42 \times 10^{-7}) - (0.238 \times 10^{-7})\\\\\text{Take the common term out }\\\\Difference = 10^{-7}(2.42 - 0.238)\\\\Difference = 10^{-7} \times 2.182\\\\Difference = 2.182 \times 10^{-7}$

Thus first strain is $2.182 \times 10^{-7}$ mm larger than second

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3 years ago