Mathematics, 17.01.2020 19:31 kimlyn58p0wyn0

4) in a poll of 20 high school seniors, 7 took a tech class and 12 took a foods class. 3 students
took both tech and foods. what is the probability that a student took either tech or foods?

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Answer from: Kayteeortiz4593

The probability that a student took either tech or foods is $\frac{1}{5}$

Solution:

In a poll of 20 high school seniors, 7 took a tech class and 12 took a foods class

3 students took both tech and foods

Therefore,

Total number of students = 20

Number of students took tech class alone = 7 - 3 = 4

Number of students took food class alone = 12 - 3 = 9

Number of students both class = 3

Thus,

Number of students took either tech or food = Total number of students - (Number of students took tech class alone + Number of students took food class alone + Number of students both class)

Number of students took either tech or food = 20 - (4+9+3)

Number of students took either tech or food = 20 - 16 = 4

To find: probability that a student took either tech or foods

$probability = \frac{\text{Number of students took either tech or food}}{\text{total number of students}}$

$proability = \frac{4}{20} = \frac{1}{5}$

Thus probability that a student took either tech or foods is $\frac{1}{5}$

Answer from: Quest

la parábola es el lugar

geométrico en el cual los puntos tienen una distancia idéntica, equidistantes,

de un punto denominado foco, f, y una recta denominada directriz

el radio vector de una

parábola es el segmento que existe entre un punto cualquiera y el foco.

por la ecuación se observa

que la parábola abre hacia la derecha, por lo cual podemos usar las siguientes fórmulas

la ecuación ordinaria de la

parábola es y^2 = 4px, donde p es la longitud desde el vértice de la parábola al

foco.

la fórmula de la directriz

es x + p = 0

resolviendo:

y^2-9x = 0

y^2 = 9x

4p = 9, entonces p = 9/4

entonces el foco tendrá la

coordenada f(9/4,0)

la directriz vendrá

expresada por

x + p = 0

x = -p

x = -9/4

el problema indica que la

ordenada es igual a 6, entonces

(6)^2=9x

x = 36/9

x = 4

entonces el punto al cual

hay que obtener la distancia será p(4,6)

calculando se tendrá: pf =

pf = 6,25 u

ver más en -

step-by-step explanation:

Answer from: Quest

it is not that hard all u have to do is plot the graph

step-by-step explanation:

Need with this if u can answer the question comment it

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4) in a poll of 20 high school seniors, 7 took a tech class and 12 took a foods class. 3 students

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