In a theater there are 20 rows of 12 seat and 20 rows of 10 seats each. All but 30 chairs are full. How many people are in the theater?

410

Step-by-step explanation:

20 rows of 12 means there are x amount of people in the 20 rows of 12 seats.

x=20*12

x=240

20 rows of 10 means there are y amount of people in the 20 rows of 10 seats.

y=20*10

y=200

We know that there are 440 seats in the theater. (240+200)

Since 30 chairs are not full, we subtract 440 from 30 and you get 410.

There are 410 people in the theater.

thethey are 410 persons in the theater

Step-by-step explanation: 20*12=240 and 20*10=200

240+200=440-30=410

step-by-step explanation:

compare

answer: c, the green line

step-by-step explanation:

there is no black line, eliminate b.

simple interest implies periodic payments, but the red line shows no payments, eliminate d.

simple interest has equal payments. if paid say every day, the graph is about a straight line (actually a stairstep).

the yellow line is not straight, eliminate a.

check: the green line is straight, answer is c.

simple interest with positive interest rate gives a straight line sloping up to the right. green line:

g(t) = $100 + ($200-$100) ÷ (20 years) × (t years)

= $100 + (4%/year) × ($100)(t years)

incidentally, the yellow line curving upward represents continuously compounded interest

y = $100 × 2^(t years / (14 assuming the yellow line hits $200 at 14 years. 2^0 is 1, so y(0) = $100; 2^(14/14) is 2, so y(14) = $200.