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12.5 square units.

Step-by-step explanation:

Step 1: draw the other diagonal, ACF. You have now divided the square into 8 triangles.

The area of the whole square is 10 by 10 square units, or 100. Each triangle will be 1/8th of the total surface, or 12.5 square units.

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5

175

step-by-step explanation:

2 inches x 10 miles = 200 miles - 3 inches = 175