17. 3(4-2(-2))......3(2(-2)).....3(-4).....-12
18. 2(-3)-3(3)......-6--9......-6+9.....3
19. 1,234.6
Answer:

Step-by-step explanation:
<u>Area of a Circular Sector</u>
A circular sector is a shape formed by two radios and the part of the circumference they define. A central angle
(in radians) is formed and the area of the sector is given by

The dimensions provided in the questions are


Converting the angle to radians

Now we compute the area


Answer:
Step-by-step explanation:
Answer:
20
Step-by-step explanation:
40 x 50% = 20
So 50% of 40 equals to 20. Now, since it says decreased by 50%, we have to subtract 20 from 40 because we already know that 20 is the 50%. So 40 - 20 gives you 20.