Will mark brainliest

x = 39

Step-by-step explanation:

The square on the angle means that angle is 90 degrees, also known as a right angle. A triangle is 180 degrees so all the sides added together is 180:

51 + 90 + x = 180

141 + x = 180

x = 39

ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.

110698.56 square miles

step-by-step explanation:

multiply 3.8 by 102

387.6

multiply 2.8 by 102

285.6

multiply those two to get