Okay so #2 is (3,-2) so its A
and #3 is (-2,15) so its B
Decimal form: 4.05, 0.5
Exact form: 9/2, 1/2
Step-by-step explanation:
Length of arc of a circle is given as:

Thus, the measure of central angle is 140°.
6(a+3) = 18 + 6a
Open the parenthesis and distribute
6a + 18 = 18 + 6a
Subtract both sides by 18
6a = 6a
Subtract both sides by 6a
0 = 0
Any value of "a" will satisfy this equation.