There are four blue marbles, an unknown number of red (r) marbles, and six yellow marbles in a bag. which expression represents the probability of randomly selecting a blue marble, replacing it, and then randomly selecting a red marble

There are a total of 4 + r + 6 marbles in the bag

The probability of a blue is    

The probability of a red is    

The probability of choosing a blue, replacing it and then a red is

×  =  [tex]\frac{4r}{100+20r+ r^{2} /[tex]

Step-by-step explanation:

idn

step-by-step explanation:

answer: - (a)

(b) 88 seats

step-by-step explanation:

given: in an auditorium, there are 22 seats in the first row and 28 seats in the second row.

thus first term=

second term=

the number of seats in a row continues to increase by 6 with each additional row.

⇒d= 6

a) given formula :

b)   let the number of seats (n) = 12

substitute n=12 in the explicit rule formed in (a)

∴there are 88 seats in 12 rows.