Answer:
0.4967<p<0.6033
Not effective
Step-by-step explanation:
given that a clinical trial tests a method designed to increase the probability of conceiving a girl.
In the study 580 babies were born, and 319 of them were girls
Sample proportion p=
Standard error of proportion p =
Margin of error for 99%= Z critical * std error=
(Since sample size is large Z value is used)
Confidence interval 99%
=
0.4967<p<0.6033
This method appears to be not effective as the confidence interval 99% contains 0.50 indicating probability for girls is still 0.50
7/10= 0.7
1/5= 0.2
2/5= 0.4
3/4= 0.75
7/8= 0.875
2/3= 0.66(repeating)
9/20= 0.45
7/25= 0.28
1. tan(x) . . . . 3rd choice
2. False . . . it is a graph of sin(x)-3
3. Of the choices offered, the best is sin(x +45°), the 2nd selection. It actually looks like a graph of sin(x +60°).
4. True . . . . it matches the graph of Question 1 shifted up 2 units
5. Probably True. The graph is of the given equation. The wording of the question leaves doubt. (It is a "graph", not an "equation." If the question is taken literally, the answer is False.)
6. 2cos(x) . . . . . the 4th choice
_____
I wish some of these curriculum materials would be scrutinized by a good editor. It is hard to learn much from defective teaching material. Good luck.
Answer:
D: (5, 0) and (4, 0)
Step-by-step explanation:
The x-intercepts of a parabola are the points where the parabola intersect the x-axis (horizontal axis). Therefore, the y-value of the x-intercepts are always 0. Since coordinates are written (x, y), we can immediately eliminate answers B and C.
Next, we look at the x-coordinates of where the parabola intersects the x-axis. We can see clearly that the parabola crosses the x-axis at and . Therefore, the x-intercepts of the given parabola are (4, 0) and (5, 0).
You could put 70/100 and cross multiple with x/5,000 first multiple 5,000 by 70 then divide by 100 meaning x=3,500