Adam is training to run in the upcoming marathon. Each day this week, he must run 15 miles. If Adam ran 21 miles this moming how many more miles does he have to run today?

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?