Question

12. A person earns * 225 per day and spends 551 per day. How much would he earn and spend in 30
days? Express them as integers. What is the total savings in 30 days?
13. A certain freezing process requires that the room temperature be lowered from 50 °C at the rate


of 5 °C every hour. What will be the room temperature 8 hours after the process begins?​

Answer 1

Answer:

$12 > so \: in \: one \: day \: person \: earns \: = 225 \\ in \: 30 \: days \: he \: will \: earn = 225 \times 30 = 6750 \\ he \: spent \: - 551in \: 1day \: in \: 30 \: days \: he \: will \: spend = - 551 \times 30 = - 165 30 \\ so \: he \: get \: loss \: of \: \\ 6750 - 16530 = - 9780 \\ 13 > in \: 1 \: hrs \: temperature \: depreciates \: - 5degree \: in \: 8 \: hrs = - 5 \times 8 = - 40degree \\ now \: room \: temperature \: is50 \: afer \: 8 \: hrs \: 50 - 40 = 10degree$