John has invested $6,000,part at 6% simple interest and part at 8% simple interest. If his interest for the year from both investments is $400. The amount invested at 6% is

question is incomplete.

8

step-by-step explanation:

just put √(2) * √(32) into a calculator. that will make the answer be 8.

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.