74. Is k^(m + n) > 0? (1) k < 0. (2) k^(m – n) < 0. OA is E. I first simplified the question to: K^m(K^n)>0, which means that either K^m and K^n are both negative, or K^m and K^n are both positive. S1: k<0, insufficient since it does not tell us about m or n. S2: Simplify into K^m/K^n<0. This mea...

Use "number of equations = number of unknowns", but beware of the twist at the end. form equations: Let A be the investment in A, B in B, p be the interest in A. thus, the interest in B is 1.5p = p*3/2. Stat. (1): thus, 2 equations: A*p = 50 B*p*(3/2)=150. (technically should be p/100, but...

The integer n is greater than 7. The average (arithmetic mean) of a group of n numbers is a. When 3 of the numbers are removed, the average of the remaining numbers is b. Which of the following expressions is the average of the 3 numbers removed? A. (na) / (n-3) B. {n(a-b)+3b} / 3 C. {n(a-b)+3b} / ...

There are x high-level officials (where x is a positive integer). Each high level official supervises x2 mid-level officials, each of whom, in turn, supervises x3 low-level officials. How many high-level officials are there? (1) There are fewer than 60 low-level officials. (2) No official is superv...

Answer should be B - the key is to use numerical examples to clarify to yourself what the answer choices really mean. See my explanation below. A public-service advertisement advises that people who have consumed alcohol should not drive until they can do so safely. In a hospital study, however, sub...

Reverse Plug in the answer choices. Look at the answer choices: they're all fractions of the form 1/nx. nx is actually the values at the bottom of the fraction - you can now go and find which of the values 1, 32, 64, 81, 729 is both a square and a cube of a number. Since you want the greatest value ...

Only seven people this century have been killed by the great white shark, the man-eater of the movies—less than those killed by bee stings. a. movies—less than those b. movies—fewer than have been c. movies, which is less than those d. movies, a number lower than the people e. movies, fewer t...

Dear sir, once again thank you for your help. but could you also plz explain me the following: y=56x^2 if x = 6 then it would be 56.6^2 then which actions do I need to take first? 6^2 and then multiply by 56? or 56^2.6^2? reagards Remember order of operations: PEMDAS Parentheses Exponents Multiplic...