Which of the following is a weakness in using the mnemonic PEMDAS to teach order of operations?
a. Its spatial ordering leads students to believe that multiplication takes precedence over division.
b. It fails to acknowledge that parentheses are just one type of grouping symbol among many
c. Its spatial ordering leads students to believe that addition takes precedence over subtraction.
d. All of the above
e. None of the above
Ans: d
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The decibel level D, a measure of loudness, is related to the relative intensity I of sound by the formula
.
?
Express relative intensity as a function of decibels.
?
A. 
B. 
C. 
D. 
Solve the problem.A class consisting of 80 students is given an exam. The third quartile for the scores on the exam is 67. This means that
A. 67 students scored 75 or higher. B. 20 students scored 67 or higher. C. 60 students scored 67 or higher. D. 75 students scored 67 or higher. E. none of these
Perform the computation.13 + (-9)
A. 22 B. 4 C. -4 D. -22
Solve the equation by using the square root property. Simplify all radicals.z2 = 121
A. {±60.5} B. {11} C. {±11} D. {±12}