Last night Vivian spent 90 minutes doing homework,2/3 hour reading, and 480 seconds fixing her lunch. How many more minutes did she spend doing her homework than she did reading and making her lunch

42 minutes

Step-by-step explanation:

We make sure all units are consistent before we make subtractions.

She spent 2/3 hours reading. 1 hour is 60 minutes, 2/3 hours reading = 2/3 * 60 = 40 minutes

She spent 480 seconds fixing lunch. 1 minute = 60 seconds, 480 seconds = 480/60 = 8 minutes

Hence, she spent 8 minutes fixing lunch and 40 minutes reading.

The number of minutes she spent doing her homework more than sleeping and reading is 90 - 40 - 8 = 42 minutes

i not know

step-by-step explanation:

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950