10. In a sale, the normal prices of furniture are reduced by 30%. The normal price of a sofa is reduced by £195.
Work out the normal price of the sofa.

Normal price of the sofa = £ 650

Step-by-step explanation:

Let x be the normal price

Reduce price = £195

30% of x = 195

x =  £ 650          

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

72 is the answer to this problem