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quester [9]
3 years ago
5

Glenn swam 2 laps every morning for 7 day. in addition to the laps he swam each morning, he swam 3 laps with his friends on Tues

day and Thursday. write the expression that show the number of laps he swam during the week. evaluate the expression to find the total number of laps he swam that week.
Mathematics
2 answers:
jolli1 [7]3 years ago
7 0
The answer is 15 because its evaluates
Rudiy273 years ago
3 0

Answer:

Expression = 2 × 7 + 3 + 3

Evaluation of the expression = 20

Step-by-step explanation:

Number of laps Glenn swam every morning = 2

Number of days for which he swam these laps = 7 days

⇒ Number of laps swam in a week = 2 × 7

Number of laps swam with his friend on Tuesday = 3

Number of laps swam with his friend on Thursday = 3

So, Expression that show the number of laps he swam during the week = 2 × 7 + 3 + 3

By evaluating the above expression, the total number of laps he swam that week = 14 + 3 + 3 = 20 laps

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finlep [7]

\boxed{ \ 5.0 \times 10^{-3} \ grams \rightarrow 5.0 \ milligrams \ }

<h3>Further explanation </h3>

Scientific notation represents the precise way scientists handle exceptionally abundant digits or extremely inadequate numbers in the product of a decimal form of number and powers of ten.  

Put differently, such numbers can be rewritten as a simple number multiplied by 10 raised to a certain exponent or power. It is a system for expressing extremely broad or exceedingly narrow digits compactly.

Scientific notation should be in the form of  

\boxed{ \ a \times 10^n \ }

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\boxed{ \ 1 \leq a \ < 10 \ }

The number "a" is called "mantissa" and the exponent "n" the order of magnitude.

The exponent tells about the size of the number.

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From the key questions asked, we face the standard form of 0.005 grams which will be converted into scientific notation.  

0.005 = \frac{5}{1,000}

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Hence, 0.005 grams is written in scientific notation as  \boxed{ \ 5.0 \times 10^{-3} \ grams \ }

Because 1 milligrams is equal to 10^{- 3} grams, then

5.0 \times 10^{-3} \ grams \times \frac{1 \ milligrams}{10^{-3} \ grams}

Hence, 0,005 grams is 5.0 milligrams.

In science, we frequently must deal with extremely small or incredibly large quantities. For a typical example, one of the recognized limitations of the microwave frequency is 300,000,000 Hz with a photon energy of 0.00000124 eV. They with many zeros can be impractical to work with, so scientists properly implement scientific notation.

The inverse of scientific notation is the standard form. To promptly change scientific notation into standard form, we reverse the process, move the decimal point to the right or left. This expanded form is called the standard form.

\boxed{ \ 3.0 \times 10^{8} \ Hz \ \rightarrow 300,000,000 \ Hz \ or \ 300 \ MHz \ }

\boxed{ \ 0.00000124 \ eV \ \rightarrow 1.24 \times 10^{-6} \ eV \ or \ 1.24 \ \mu eV \ }  

<h3>Learn more</h3>
  1. How is 0.00069 written in scientific notation? brainly.com/question/7263463
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  3. Convert the number expressed in standard form to scientific notation brainly.com/question/10436883

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