A 20 question multiple choice test is given to someone who randomly guesses at all 20 questions. If each question has four answer choices, what is the expected number the person will answer correctly? Answer values:

a. 0.191

b. 0.228

c. 0.772

d. 0.963

choice b is correct

step-by-step explanation:

we have been given the following system of linear inequalities;

we are required to graphically determine the solution to these system of inequalities. using a graphing tool, the solution is as shown in the attachment below;

answer: the first one

step-by-step explanation: use a calculator and divide the minutes by the dollars.

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq