able ength ed are t a 27x. 27 (b) The equation y - 2.00x = 2.50 relates the cost y of a taxicab journey to distance x in km nered by the cab. 7. Ragini bought an energy-efficient washing machine, She will save about is titres of water per with (a) Write an equation of direct variation to describe how many litres of water y Ragini saves for skates of laundry she washes. (b) If Ragini does one load of laundry dally, how many litres of water will she save at the end of a yeats 8. Think and answer. If you double an x-value in a direct variation, will the corresponding, y value datter Explain. 9. The height to which a balloon with hydrogen gas rises in the air varies directly as time. Given below are some observations about the time and the corresponding height of the balloon (in metres), Find the missing terras in the table. Time (in minutes) 3 4 25 Height of the balloon (in metres) 48 84 1860 10. If d varies directly as t, and if d = 4 when t =9, find d when I = 21. 11. The mass of a uniform copper bar varies directly as its length. If a bar 40 cm long has a mass of approximately 420 B find the mass of a bar 136 cm long, 12. A fish with a mass of 3 kg causes a fishing pole to bend 9 cm. If the amount of bending varies directly as the mass, how much will the pole bend for a 2 kg fish? 13. At a party, 8 bottles of soft drink are served for every batch of 5 children. How many bottles would be served if 40 children were present at the party? 14. Harsh takes 150 steps in walking a distance of 125 metres. What distance would he cover in 360 steps? 15. The second class railway fare for 240 km of journey is 125. What would be the fare for a journey of 144 km? Assume that the fare varies directly as the length of the journey. asts a RT E are
Answers
Answer:
Step-by-step explanation:
AL = 10 cm, AM = 20 cm, AN = 50 cm
AO = 60 cm, AD = 90 cm
From given data,
MO = AO – AM = 60 – 20 = 40 cm
OD = AD – A0 = 90 – 60 = 30 cm
ND = AD – AN = 90 – 50 = 40 cm
LN = AN – AL = 50 – 10 = 40 cm
Area of Polygon = (Area of triangle AMF) + (Area of trapezium MOEF) +
(Area of triangle DNC) + (Area of trapezium NLBC) +
(Area of triangle ALB)
= (0.5 x AM x MF) + [0.5 x (MF + OE) x OM] + (0.5 x OD x OE) +
(0.5 x DN x NC) + [0.5 x (LB + NC) x NL] + (0.5 x AL x LB)
= (0.5 x 20 x 20) + [0.5 x (20 + 60) x (40)] +(0.5 x 30 x 60) +
(0.5 x 40 x 40) +[0.5 x (30 + 40) x (40)] + (0.5 x 10 x 30)
= 200 + 1600 + 900 + 800 + 1400 +150 = 5050 cm2
Answer:
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Step-by-step explanation:
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