Answer:
Given -
In a certain chemical, the ratio of zinc to copper is 4 to 13.
The chemical contains 546 grams of copper.
Prove -
How many grams of zinc does it chemical contain.
Answer
suppose that scalar multiple of the zinc and copper be y .
As given
In a certain chemical, the ratio of zinc to copper is 4 to 13.
The chemical contains 546 grams of copper.
Than equation is
13y = 546
13y = 546
y = 42
Zinc contain in the certain chemical = 4y
= 4 42
= 168 grams
Therefore 168 grams of zinc contain in a certain chemical .Step-by-step explanation:
Answer:
108
I determined my answer by multiplying 4 x 3 x 3 x 3 = 108
Step-by-step explanation:
daughters born in 1950 = 4 x 3 = 12
daughters born in 1980 = 12 x 3 = 36
daughters born in 2010 = 36 x 3 = 108
B, that is where the line crosses the x axis
So first we start off multiplying 3 • 7 to find a common denominator and you get 21. Then because you technically multiplied 3 by 7 you also have to multiply 1 by 7! you instead of 1/3 you have 7/21! do the similar thing to 2/7 but instead of multiplying it by 7 you use 3 so for this one instead of 2/7 it’s 6/21! add the two fractions together and get 13/21! subtract 13 from 21 to see what the remaining fraction is and your answer is 8/21! hope this helps!!
Answer:
So the answer for this case would be n=183 rounded up to the nearest integer
Step-by-step explanation:
Information provided
represent the sample mean
population mean (variable of interest)
represent the population standard deviation
n represent the sample size
the margin of error desired
Solution to the problem
The margin of error is given by this formula:
(a)
And on this case we have that ME =0.023 and we are interested in order to find the value of n, if we solve n from equation (a) we got:
(b)
The confidence level is 97% or 0.97 and the significance would be 
and 
then the critical value would be: 
, replacing into formula (5) we got:
So the answer for this case would be n=183 rounded up to the nearest integer
