Answer:
zinc=172
hope that helps
Step-by-step explanation:
4/17= z/731
17×z=4×731
17×z=2,924
divide 17 on both sides
z=172
Answer:
Mean = 0.45
Standard deviation = 0.04035
Step-by-step explanation:
This is actually a very simple problem.
The question gives us the report that 45% of the teenagers in the age bracket own smartphones.
P = mean = 45%
Therefore the mean is 0.45.
I will go ahead to help you calculate the standard deviation.
√p(1-p)/n
n = 152
P = 0.45
√0.45(1-0.45)/152
= √0.45(0.55)/152
= √0.2475/152
= √ 0.001628
= 0.04035
Suppose there are x number of clubs in the pack
P( draw a diamond) = 13 / 59
P( draw a club) = x / 58
so P( diamond then a club) = 13x / (58*59) = 13x / 3422
so we have the equattion
117 / 1711 = 13x / 3422
234 / 3422 = 13x / 3422
therefore x = 234 / 13 = 18 clubs :-
that is 5 more clubs than in a normal pack
So the number of extra spades = 59 - 52 - 5 = 2
Answer:
f(x) = (x + 6)² - 29
Step-by-step explanation:
Given
f(x) = x² + 12x + 7
To complete the square
add/subtract ( half the coefficient of the x- term )² to x² + 12x
x² + 2(6)x + 36 - 36 + 7
= (x + 6)² - 29, thus
f(x) = (x + 6)² - 29