There are 9 red marbles and 4 blue marbles in a bag? What is the ratio blue marbles to all marbles in the bag? Ratio of blue marbles to red marbles

4:13 for ratio the blue marbles and all marbles and 4:9 for the ratio of blue and red marbles

Step-by-step explanation: first there are 4 marbles in the bag that are blue the prob says ratio to blue marbles to all the marbles in the bag so 9+4=13 so the blue marbles to all marbles is 4:13. Next it says what is the ratio of blue marbles to red marbles so 4:9 would be the answer for blue to red

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.