72 is equal to 80% of a number n. Write and solve and equation to find n. Write the percent as a decimal.
2 answers:
Answer:
n = 90
Step-by-step explanation:
To solve this, we need to write the questions mathematically and then solve
72 = 80% of n
72 = × n
72 =
Multiply both-side of the equation by 100
72 × 100 = ×100
At the right-hand side of the equation, 100 will cancel-out 100, leaving us with just 80 n
7200 = 80 n
Divide both-side of the equation by 80
=
(On the right-hand side of the equation, 80 will cancel out 80 leaving us with just n while on the left-hand side of the equation 7200 will be divide by 80)
= n
90 = n
n = 90
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Note that this shape is a hexagon. Thus, we can divide a hexagon into 6 equilateral triangles, each with measures of 60 degrees. Just move OQ to the adjacent clockwise equilateral triangle and see what it overlaps with.
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Answer:
(b) 1.95
Step-by-step explanation:
One of the easiest ways to evaluate an arithmetic expression of almost any kind is to type it into an on-line calculator. Many times, typing it into a search box is equivalent.
<h3>Application</h3>See the attachment for the search box input (at top) and the result. This calculator has the benefit that it <em>always follows the Order of Operations</em> when evaluating an expression. (Not all calculators do.)
ln(7) ≈ 1.95
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<em>Additional comment</em>
If your math course is asking you to evaluate such expressions, you have probably been provided a calculator to use, or given the requirements for a calculator suitable for use in the course.
There are some very nice calculator apps for phone and tablet. Many phones and tablets already come with built-in calculator apps. For the purpose here, you need a "scientific" or "graphing" calculator. A 4-function calculator will not do.
As with any tool, it is always a good idea to read the manual for your calculator and work through any example problems.
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Years ago, handheld calculators were not available, and most desktop calculators were only capable of the basic four arithmetic functions. Finding a logarithm required use of a table of logarithms. Such tables were published in mathematical handbooks, and extracts of those often appeared as appendices in math textbooks used in school.
