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What is 45 kph converted to mph?

Since both kilometers per hour and miles per hour use hours for the time unit, there is no need to do any further conversions. The kilometer is the SI unit for length in the metric system, and the mile is a unit of length in the imperial system. The Roman mile equalled 1,000 double paces of their marching soldiers. The British modified the Roman mile to equal 8 furlongs, which is 5,280 feet.

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How do you find the perimeter of a trapezoid?

Understand the equationThe equation to use to find the perimeter of a trapezoid is P = a + b + c + d. In this equation the P stands for perimeter, while the a, b, c and d each stand for one side of the trapezoid. In order to use this equation, you need to know the values of each side of the trapezoid.Fill in the equationTo fill in the values for the equation, look at each side of the trapezoid. The two sides that are parallel to each other are the bases, and are the a and b sides. The remaining two sides of the trapezoid are the c and d sides. Take the value for each of these sides, and fill i..

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Can you use a calculator to simplify rational expressions?

A rational expression is a fraction in which the numerator and/or denominator are polynomials (expressions of more than two algebraic terms). You can simplify a rational expression by reducing it to its lowest terms. To do this, divide out the common factors in the numerator and denominator.\nWebsites such as Mathportal.org offer calculators capable of simplifying rational expressions. Enter the expression into the website interface, and the calculator does the work for you. Since simplifying rational expressions mostly involves multiplying and dividing, you can also use a regular calculator t..

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How do you solve improper fractions?

Calculate how many times the denominator goes into the numeratorConsider the improper fraction 23/7. Multiply 7 by successive integers until you find the multiple that provides the closest answer without going over. Write down the number of that multiple; in this case, the answer is 3, as 7 x 3 = 21, but 7 x 4 = 28, which is more than 23.Find the product of the multiple and the denominatorMultiply the multiple (in this case, 3) by the denominator (in this case, 7). Subtract the product (21) from the original numerator (23) to yield the answer, 2.Write the corrected mixed numeralWrite the multi..

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What is a cumulative frequency polygon?

Frequency polygons are line graphs joined by all the midpoints at the top of the bars of histograms. Frequency polygons illustrate the shape of the distribution of the data. The endpoints of a frequency polygon lie on the x-axis. To construct a frequency polygon, a bar graph or histogram must first be drawn. Then, a line graph is drawn over the bar graph. Frequency polygons and histograms are similar in that they show the same information but in a different manner. When comparing two different sets of data, it is often easier to display the data using a frequency polygon versus a histogram. So..

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What is the square root of 4000?

The simplified form of a square root can be found by factoring out the square of a whole number. For 4,000, the factorization leaves 400 and 10, simplifying the equation to the square root of 400 times the square root of 10. Since the square root of 400 is the whole number 20, the final simplified form is written as 20 x sqrt(10), since the square root of 10 cannot be simplified any further. The function sqrt represents the radical sign.

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What are the factors of 15?

The numbers three and five are prime factors of 15, as they are both prime numbers. A prime number is a number that is only divisible by itself and one. Although 15 has only prime factors, many other numbers have both prime and nonprime factors. For example, two and three are prime factors of 12, and four and six are the nonprime factors of 12.

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What are the meanings of "sin", "cos", "tan", "csc", "sec" and "cot"?

In trigonometry, the three sides of a right triangle are identified as the hypotenuse, the side opposite the selected angle, and the side adjacent to the selected angle. Each of the trigonometric functions relates the measure of the selected angle to one of three ratios involving the lengths of the sides. The sine of an angle is equal to the length of the side opposite the angle over the length of the hypotenuse. The cosine of an angle is equal to the length of the adjacent side over the length of the hypotenuse. The tangent of an angle is equal to the length of the opposite side over the adja..

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What is the chi-square formula?

The Chi square test applies to categorical data. This nonparametric test determines whether the observed counts for the categories differ from the expected counts. Look up the p-value for the Chi square statistic obtained in a statistical table in order to determine if the test reaches significance. Before using the table, calculate the degrees of freedom for the problem. For two independent variables, the degrees of freedom are the number of levels of the first variable minus one, times the number of levels of the second variable minus one. Hence, df = (r - 1) (s - 1), where r is the number o..

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Who is the father of statistics?

Fisher, born in 1890, pioneered the use of statistical procedures in scientific experiments, according to the Encyclopaedia Britannica. He received a degree in astronomy from Cambridge in 1912, but it was in the fields of genetics, eugenics and evolutionary biology that he made his mark. His book, "Statistical Methods for Research Workers," became a standard reference work for many scientific disciplines.

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