a girl has $4200 to invest for 4 months. if she needs the money to earn $112 in that time, at what rate of simple interest must a girl invest?

8%

Step-by-step explanation:

i = prt

112 = 4200 * r *4/12

112 = r * (4200) * (4/12)

112 = r (1400)

112/1400 = r

.08 = r

.08 * 100 = 8%

Verify by:

i = 4200 * .08 * 4/12

i = 112

he spend 5.1 minutes chatting with his friends.

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5.1

step-by-step explanation:

when the line is solid:

when the line is dashed:

this > inequality sign means:

this < inequality sign means:

this > inequality sign means:

this < inequality sign means:

about the problem:

srry i'm not done ! i'll