SCORE: 15/18
INCORRECT ANSWERS:
1. If m & k are positive and 10m^2k^-1 = 100 m, what is m^-1 in terms of k?
*k/10
*k/90
*square root of k/10
*1/10k
*1/90k
i really need to review negative exponents. That's my main problem. But can you please explain me this ?
2. Let the function f be defined by f(x)=x+1. If 2f(p) =20, what is the value of f(3p) ?
Okay so my answer was 27, but i was off by one. But i think i was totally off in my method, although the answer was actually 28.
What i did was first isolate 2f(p)=20, to get f(p)=10. Then i put the 10 in the x spot, to get 10=x+1, so x=9. Then i put 9 in the p's spot to get 27. My method sounds wrong.
3.In the xy- coordinate plane, the distance between point B(10,18) and point A(x,3) is 17. What is one possible value for x?
My answer was 8, but the actual answers were 2, and 18. I actually do understand how they got this. First you have to know what the distance formula is. Then square 17 to get 289. 18-3= 15, then you square 15 and get 225. 289-225 is 64. That is how i got 8. But then i forgot to plug it back into the problem and either add or subtract 8 from 10.
1 comment:
1. Review these rules of exponents. http://webpages.charter.net/thejacowskis/chapter6/section1.html
Remember, that a^x^y is equal to a^(x*y). That makes things easier. As well, a^(-x)= 1/(a^x)
2. Your method was correct, you just made a mistake at the end. You solved that P=9, which is good. You did that correctly. Then they wanted to know what F(3P) is. 3P=3*9 or 27. But they want F(3P), not 3P. F(3P)=3P+1, or 28.
3. careless error. be thorough
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