Four-ninths of a drink mix is dye and the rest is pure ugar. When the mix is added to water a gallon of the drink is made that is 7.5% sugar. What percentage of the gallon is dye?
In the function above, if f(k) = 2, then which one of the following could be a value of k?
(A) –1
(B) 0
(C) 0.5
(D) 2.5
(E) 4
f(k)=2
On the graph, that would mean the x is k and the y is2
In the first quadrant when y = 2 the value for x could be from anywhere from roughly 1.75 to 3.5.
None of the answer choices are ranges but D is within our range. And since the question asks what value “could be” k, that must be the answer.
D.
A refresher on finding a range of values with functions:
A company produces baseball cards in equal numbers of regular packs of 16 and deluxe packs of 30. If, on a certain day a company produces 241 cards, what is the smallest number of additional cards the company needs to produce in order to maintain its regular production practice?
A) 5
B) 11
C) 21
D) 35
E) 46
If n is an integer from 1 to 96 (inclusive), what is the probability for N being divisible by 8 when N=n*(n+1)*(n+2)
A. 25%
B 50%
C 62.5%
D. 72.5%
E. 75%
Let f(n) = n*(n+1)*(n+2)
The product of the three consecutive numbers will be divisible by 8 if the first of the 3 consecutive numbers is even as it prime factors out to at least three 2’s.
f(2); the function becomes 2*3*4 will be divisible by 8 because 2 is even.
f(52), the function becomes 52*53*54 will be divisible by 8 because 52 is even
f(61), the function becomes 61*62*63 will NOT be divisible by 8 because 61 is odd
However, there is one more case where the function will be divisible by 8 even when the first number of the three consecutive number is odd;
f(7): the function becomes 7*8*9; the middle term 8 is divisible by 8 and thus the entire function becomes divisible by 8.
f(63): the function becomes 63*64*65; the middle term 64 is divisible by 8 and thus the entire function becomes divisible by 8.
Probability = desired/total
How many functions are there;
f(1) = 1*2*3
f(2) = 2*3*4
f(3) = 3*4*5
f(4) = 4*5*6
…
f(95) = 95*96*97
f(96) = 96*97*98
Total = 96
To find the favorable cases; we need to find the count of all even numbers from 1 to 96 and the count of all numbers that are divisible by 8.
Count of even numbers = (96–2)/2+1=47+1=48
Total numbers divisible by 8 = (96–8)/8+1 = 12
Probability=48+1296=6096=0.625=62.5Probability=48+1296=6096=0.625=62.5
C
Which of the following represents all the possible values of x that are solutions to the equation 3x=|x^2 -10|?
A Straight Line is formed using two points A(3,3) and B(6,6). Another point P(x,y) lies between A and B such that AP/BP = 10. The coordinates of P are ____ ?
(A) (5, 5)
(B) ( 6 1/11,6 1/11)
(C) (6 3/11, 6 3/11)
(D) (3 6/11, 3 6/11)
(E) (5 8/11, 5 8/11)
