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3 years ago

If an angle measures 90°, then it is a right angle.

Mathematics

1 answer:

LUCKY_DIMON [66]3 years ago

4 0

Answer:

The answer based on the original statement is A: 2 only.

Step-by-step explanation:

It might seem obvious to be D, becasue we both know that all of the statements are true. But, based on the statement, we don’t necessarily know that. The statement only tells us that if a angle is 90 degrees it is a right angle. It does not specify if another angle such as 91 degrees would also be considered a right angle. Therefore, we would not be able to draw any other conclusions other than number 2 based on the statement given in the question.

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Rena wrote all the integers from 1 to 19. How many digits did she write?

harkovskaia [24]

She wrote 19 digits

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2 years ago

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What is the inverse of f(x) = 2x − 8?

s2008m [1.1K]

To find the inverse, interchange the variables and solve for y.
f^-1 (x) = 4 + x/2

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3 years ago

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A teacher is making a history test composed of the same number of multiple-choice questions as short-answer questions. She estim

STALIN [3.7K]

Answer:

The inequality is $5.5n \leq 45$

Step-by-step explanation:

Total time:

The total time to complete the test is the sum of the number of multiple-choice questions multiplied by the time it takes to solve each and the number of short-answer questions multiply by the time it takes to solve each.

In this question:

Same number(n) of both.

Multiple-choice takes 2 minutes, short-answer takes 3.5 minutes. The total time is given by:

$T = 2n + 3.5n = 5.5n$

Write an inequality to determine how many questions, n, the teacher can include if the test must take students less than 45 minutes to complete.?

This means that:

$T \leq 45$

$5.5n \leq 45$

The inequality is $5.5n \leq 45$

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3 years ago

The coordinates of point P on a coordinate grid are (−5, −6). Point P is reflected across the y-axis to obtain point Q and acros

Scilla [17]

Reflection of point (x ,y) about x axis is given by (x,-y) and about y axis is given by (-x,y) .treat the line as plane mirror about which you have to find out point reflection .thus Q is (5 ,-6) and R is(-5,6)..

5 0

3 years ago

The "mammals" data set in the "MASS" library contains the result of a study of sleep in mammal species. 1 2 Load the "mammals" d

dusya [7]

Complete Question:

The complete question is shown on the first uploaded image

Answer:

The probability that the random you randomly select species that are greater than 200 kg is = 7/62

Step-by-step explanation:

Step One: Load the data set in to the R work space

data(mammals,package="MASS")

attach(mammals)

Step 2 : Obtain the list of the species that are greater than 200 and store it on y variable.

y <- subset(mammals,body>200)

Step Three : Obtain the total size

nrow(mammals)

Step Four : Obtain the sum of species greater than 200

sum(body > 200)

total size = 62

size with body > 200 = 7

hence

required probability = 7/62

7 0

3 years ago