A triangle has a base that is increasing at a rate of 3cm/sec and a height that is decreasing at a rate of 2 cm/sec. Find the rate of change of the area of the triangle when the height is 10cm and the area is 40 cm^2

Tina practice piano for 15 hours last month and 45 hours this month use multiplication to write a statement comparing me i was tina practice during the two months use addition to write a statement comparing the hours tina practice during the two months

Need so much on this one how many yards?

As a salesperson you get $50/day and $3.60/each sales you make.if you want to make $60 in one day, how many sales would you need need to make ? a 3b 4c 5d 6 show work.