Margie calculated that she would spend $175 on school supplies this year. she actually spent $97.50 on school supplies. what is margie's percent of error?

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?

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?