The following venn diagram shows the results of a teacher survey. a teacher asked her class which students owned android phones, which owns iphones, and which had service with at& t. what is the probability of randomly selecting a student from the class that owns an android phone or had service with at& t.

group of answer choices

iphone-5
at& t-2
android- 6
iphone and at& t-6
at& t and android- 6
none- 7

0.60
0.73
0.78
0.46

Step-by-step explanation:

The image attached shows the Venn Diagram.

From the diagram, 12 students use AT&T service and 6 students use an Android phone only. The total number of students is 30.

The probability to pick a student with Android is

The probability to pick a studen with AT&T is

Remeber, the probability of one event OR another implies the sum of probabilities.

Therefore, there's a probability of 0.60 to select a student that owns an Android Phone or has service with AT&T.

both equations and proportions are better.

the correct option is:

b. a value of the variable that makes the polynomial equal to zero.

the root or roots of a polynomial are the values of the variable that makes the polynomial equal to 0. we can find the roots of a polynomial making the expression equal to 0 and then, isolating the variable (it it has just one variable).

for example, given the following polynomial:

the root or zero of the polynomial, can be found by making the expression equal to 0, and then, isolating the variable, so, finding the root we have:

therefore, we have that the root of the polynomial is equal to 2.

we must remember that the number of roots that a polynomial can have, will depend on the degree of the polynomial, a first degree polynomial have will have one single root, a second degree polynomial (quadratic expression) may have two roots and so.

hence the correct option is:

b. a value of the variable that makes the polynomial equal to zero.

have a nice day!