<p>Can someone explain how to do these problems? Thanks.
Sec. 3 #18,20
Sec. 6 #6-8,16-18
Sec. 9 #8,10,11,15,16</p>
<p>For number 18 and 20 just plug in numbers. </p>
<h1>18</h1>
<p>x=10
z=2
n=3
So a customer buys 3 shirts, the first shirt costs 10 dollars, the second and third shirts cost 8 dollars each (each shirt after the first **** costs 2 dollars less). 10 + 8 + 8 = 26 dollars total.
Plug in the numbers into each of the choices and your answer is A. </p>
<p>You can plug in for 20, or you can just set up the variables...</p>
<h1>20</h1>
<p>N = men
women = N + 75</p>
<p>Men / men + women</p>
<p>N / n + (n+75) = n/2n+75
To get the percentage multiply that by 100 and your answer is 100n/2n+75
E.</p>
<p>Page numbers too next time please.</p>
<h1>18</h1>
<p>The first shirt is x. Any more is (x-z).
So If n is the total number, then the first shirt costs x. And the remainder costs (n-1)(x-z).</p>
<p>So the answer is A.</p>
<h1>20</h1>
<p>Percent is amount over total. The total is men + women. The women equals men +75. So the total is 2n + 75. Multiply by 100 for percent.
Therefore the percentage is 100n/(2n+75)</p>
<p>So the answer is E.</p>
<h1>6</h1>
<p>If there are 2 white eggs to every 3 brown eggs, then it must be a multiple of 5. 2 whites go with 3 browns in every set of 5. 12 is not a multiple of 5 and therefore can not be split in the proper ratio.</p>
<p>So the answer is B.</p>
<h1>7</h1>
<p>18[sqrt(18)]=18[sqrt(9)<em>sqrt(2)]=18[3</em>sqrt(2)]=54[sqrt(2)]
r = 54
t = 2</p>
<p>So the answer is C</p>
<h1>8</h1>
<p>The total degrees in a triangle is 180. There are 3 relevant triangles. So the total angle is 540 for those 3.
There are 3 angles that are not labeled. However, those three form a 180 degree angle, so we dont need their individual values. Therefore 2a+3b+c must equal the remainder, which is 360.
360=2a+3b+c
360-2a-3b=c</p>
<p>So the answer is E.</p>
<h1>16</h1>
<p>Since h(x) = 14 + (x^2)/4, h(2,) = 14 + ([2m]^2)/4
So 14 + (4m^2)/4 = 9m
14 + m^2 = 9m
m^2 - 9m +14 = 0
(m-7)(m-2) = 0
m = 2 or 7</p>
<p>So the answer is either 2 or 7.</p>
<h1>17</h1>
<p>Type A chimes 8 times at 8 :00 for the first column and 2 times for the last column. So 10 for each type A.
Type B chimes 8 for the first column, so 8 total for type B.
Type C chimes 1 for the second column and 2 for the third, so 3 for each type C.
The total is 10<em>A+8</em>B+3<em>C = 10</em>10+8<em>5+3</em>3 = 149</p>
<p>So the answer is 149.</p>
<h1>18</h1>
<p>Number of places for the shaded card = 3.
Number of places left for the second card = 4
Number of places left for the third card = 3
Number of places left for the fourth card = 2
Number of places left for the last card = 1
Multiply them together for the answer.</p>
<p>So the answer is 72.</p>
<h1>8</h1>
<p>Since the center is at x value = 4, the distance from the x value must be the same for y values to equal.
Both 2 and 6 are both a distance of 2 away from the center.</p>
<p>So the answer is C.</p>
<h1>10</h1>
<p>There are 11 people taller than her and 11 people shorter than her. If you add Stacy in then the total is 23.</p>
<p>So the answer is B.</p>
<h1>11</h1>
<p>a affects the direction of the graph. c affects the y intercept. b affects the left/right positioning. Since a and c are negative the graph must oint down and must have an y intercept below the x axis.</p>
<p>So the answer is A.</p>
<h1>15</h1>
<p>Since they are consecutive, the smallest is x, the second smallest is 2 more than x and the biggest is 4 more than x. The 2 smallest are the legs and the biggest is the hypotenuse. Use pythagorean theorem.
x^2 + (x+2)^2 = (x+4)^2</p>
<p>So the answer is C.</p>
<h1>16</h1>
<p>I is true because x cannot equal x + 1/x.
II is not true because if x is an integer greater than 1, y must be x + a fraction, and therefore it cannot be an integer.
III is true because if you multiply the original equation by x, you get xy = x^2 + 1. Therefore no matter what, xy will always be 1 more than x^2.</p>
<p>So the answer is D.</p>