Over the past several months, the water level of a lake has been decreasing by 7% each week. If the highest water level before the decrease started was 540 ft., what was the level at the end of 8 weeks?

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

Evaluate 8j -k+148j−k+14 when j=0.25j=0.25 and k=1k=1.