A book which cost 300 naira was sold for 240naira. what was the loss percentage?​

20%

Step-by-step explanation:

Formula: Put the difference of the two values over the cost price and multiply it by 100.

300 - 240 = 60

60/300 × 100 = 20%

Checking

300 × 20% = 60 (Which equals the amount lost)

answer: b.36 feet

step-by-step explanation:

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