Step-by-step explanation: Compatible numbers are numbers in pairs that by mental exercise one can easily add, subtract, multiply, or divide. This is applied usually in estimation to approximate a calculation. Here, you replace actual numbers with compatible numbers (easy to estimate pairs).
Two numbers with close quotients with 1754 on dividing by 9 are by estimation 194 and 195. To check, on multiplying these figures by 9 you get 1746 and 1755 respectively. 1755 is actually very close to the required result, therefore 195 is a better estimate than 194 if we were to pick just one. So 194 and 195 fits perfectly
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B(d) is a function of the number of days d since she opened the account.B(0) is the balance at day=0 now, since the length of segment OA is half of the length of segment OB, and the length of segment OB is proportional to the max balance, namely $400, then the segment OA is proportional to 400/2=200
