A solution needs to be cooled at a rate of -7°C per minute. How long will it take for the solutions temperature to change from 0° C to -42° C?

6 minutes.

Step-by-step explanation:

There is a difference of 42 between 0° and -42° (given), and 42°/7° per minute= 6 minutes.

we know that

applying the law of sines

°

so

∠j=18°

∠k=29°

∠l=180-(18+29)=133°

the answer part a) is

the measure of angle k is  ≈29°

part b)  the measure of angle k could also be

(180-29)=151°

so

∠j=18°

∠k=151°

∠l=180-(18+151)=11°

the answer part b) is

the measure of angle k could also be 151°

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step-by-step explanation: