Li and jen went shopping. • li bought 5 pairs of earrings and 1 necklace for a total of $68. • jen bought 1 pair of earrings and 2 necklaces for a total of $55. each pair of earrings cost e dollars and each necklace cost n dollars. which system of equations can be used to find the cost, in dollars, of each pair of earrings and each necklace? a. 5e + n = $68 e + 2n = $55 b. 5e + n = $68 2e + n = $55 c. e + 5n = $68 e + 2n = $55 d. 5e + 2n = $68       e + n = $55

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.