67. Erica wanted to calculate the sale price of an item that was marked $45 and is 30% off. Which would not give Erica the sale-price?

Refer to interactive solution 17.45 to review a method by which this problem can be solved. the fundamental frequencies of two air columns are the same. column a is open at both ends, while column b is open at only one end. the length of column a is 0.504 m. what is the length of column b?

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*