Express the phrase as a rate and a unit rate: 20 dollars for 4 books

Answer:

f(-1) = 3

Step-by-step explanation:

See the graph shown in the attached file with the given question.

The graph passes through (0.5,0) point on the X-axis and (0,1) point on the Y-axis.

So, the length of the X-intercept is 0.5 and that of Y-intercept is 1.

Hence, the equation of the straight line graph is  

{Using the intercept form}

⇒ 2x + y = 1 ....... (1)  

Now, y = f(x) = 1 - 2x

Hence, f(-1) = 1 - 2 ( - 1 ) = 3 (Answer)

Answer:

b - (-2,-1)

Step-by-step explanation:

A function is a mapping in which each element of the domain, or input, is mapped to one element of the range, or output.

In this mapping, the input value -2 is mapped to both 2 and -1; this makes the points (-2, 2) and (-2, -1).  If one of these two was removed, the mapping becomes a function.

The only one of these listed in the values given is (-2, -1).

Answer:

(-2,-1)

Step-by-step explanation:

One pair of vertical angles measures 90 degrees each, and the other pair of vertical angles measures 90 degrees each as well.

How to solve for the angles

When two lines intersect, they form four angles. The angles that are opposite each other, called vertical angles, are equal. The sum of the measures of the vertical angles and the adjacent angles is 180° because they form a straight line.

Solving for x we get:

2x + 180 - x = 270

x = 90

Therefore, one pair of vertical angles measures 90 degrees each, and the other pair of vertical angles measures 90 degrees each as well.

Read more on angles  here brainly.com/question/25770607

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