Please help me! :) Evaluate the expression 3.14(a2 + ab) when a = 3 and b = 4.

3.14 [(3×2)+(3×4)]

3.14(6+7)

3.14×13

so the answer is 40.82

:) have a nice day

56.52

Step-by-step explanation:

You want to begin with plugging in a and b into the expression.

a=3

b=4

3.14(3(2)+3(4))

Then simplify

3.14(6+12)

3.14(18)=56.52

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

13.46

step-by-step explanation:

16.80 x .20 = 13.46