11. The first four terms of an AP, whose first term is -2 and common difference is -2 are

- 2, - 4, - 6, -8

Step-by-step explanation:

If the first term of the arithmetic sequence is is -2 , and the common difference is -2, then we can generate the first four terms the following way:

a1 = - 2

a2 = - 2 - 2 = - 4

a3 = - 4 - 2 = - 6

a4 = - 6 - 2 = - 8

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles