An elephant can run of a mile in 36 seconds. at this rate, which expression can be used to determine how fast an elephant runs in miles per hour? plz asap

The expression that can be used to determine how fast an elephant runs in miles per hour is 100 miles per hour

Solution:

Given that,

Distance covered by an elephant in 36 seconds is equal to 1 mile

Therefore, distance covered by the elephant in 1 second is   mile

Therefore, distance covered by the elephant in 60 seconds (60 seconds = 1 minute) is

Therefore, distance covered by the elephant in 60 minute (60 minute = 1 hour) is

Hence the expression that can be used to determine how fast an elephant runs in miles per hour is 100 miles per hour

correct answer:

b.(19,-2)

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9