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BartSMP [9]
3 years ago
8

Calculate the cost of spraying a rectangular field 720 m by 500 m with a pesticide at a cost of $23.50 per hectare.

Mathematics
1 answer:
Drupady [299]3 years ago
4 0

(I) $ 846

(II) 157.64 cm²

Step-by-step explanation:

(I)

The area of the rectangle is;

720 * 500 = 360,000

10,000 m2 = 1 hectare

Therefore to convert the area to hectare;

360,000 / 10,000

= 36

If the cost of spraying the pesticide is $23.50 per hectare, then total cost is;

36 * 23.50

= 846

(II)

To find the area of the trapezoid;

(sum of the parallel sides * height) / 2

Height is the diameter of the circle – 21 cm

((19 + 29)*21) / 2

= 504

Then the area of the circle;

πr²

π * (21/2)²

= 346.36

The shaded area;

Area of the trapezoid – area of the circle

504 – 346.36

= 157.64

Learn More:

brainly.com/question/10676678

brainly.com/question/12389990

#LearnWithBrainly

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