Atextbook store sold a combined total of 282 biology and physics textbooks in a week. the number of biology textbooks sold was two times the number of
physics textbooks sold. how many textbooks of each type were sold?

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.

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

At the electronics store you have a coupon for 20% off up to 2 cds you buy for cds with the original cost of $10.99 each the sales tax is 5% what is the total cost of your purchase