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Arte-miy333 [17]
2 years ago
15

A cyclist travels 4 miles in 10 minutes and then a further 8 miles in 30 minutes without stopping. Calculate the cyclist's avera

ge speed in mph.
Mathematics
1 answer:
andreev551 [17]2 years ago
5 0

Answer:

0.3 mph

Step-by-step explanation:

Yee

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Step-by-step explanation:

Hypotenuse² =base² + altitude²

(3x + 4)² = (2x + 1)² + (3x)²

{Use (a+b)² = a² + 2ab + b²}

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a = 4 ; b =-20  ; c = -15

D = b² - 4ac  = (-20)² - 4*4*(-15) = 400 + 240 = 640

√D = √640 = 25.30

x=\dfrac{-b+\sqrt{D}}{2a} \ ; \ x=\dfrac{-b-\sqrt{D}}{2a}\\\\\\x=\dfrac{20+25.30}{2*4} \ ; \ x=\dfrac{20-25.30}{2*4}\\\\\\x=\dfrac{45.30}{8} \ ; \  x =\dfrac{-5.30}{8}\\\\

x = 5 .66   ; x = -0.66

Ignore x = -0.66 as length of a side cannot be negative

Answer : x = 5.66

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2 years ago
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Answer:

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Step-by-step explanation:

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