84.27 (c) Asif cycles a distance of 105 km,
On the first part of his journey he cycles 60 km in 2 hours 24 minutes,
On the second part of his journey he cycles 45 km at 20 km/h,
Find his average speed for the whole journey,

46.2+112.3

step-by-step explanation:

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step-by-step explanation:

the answer is 8/21

hope this

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places