Answer:
Step-by-step explanation:
45x = 9*5*x
81 = 9*9
GCF = 9
Take 9 out using distributive property { a*b - c*b = b*(a-b)}
45x - 81 = 9*5x - 9*9
= 9*(5x - 9)
=9(5x-9)
2t<-4 divide both sides by 2
t<-2
...
7t>49 divide both sides by 7
t>7
So t=(-oo,-2) and t=(7,+oo)
t=(-oo,-2)U(7,+oo)
Answer:
The correct answer is:
(a) Mean = 170,
Standard deviation = 30
(b) 1700
Step-by-step explanation:
Given:
(a)
Mean of monthly expenses will be:
=
=
=
Standard deviation will be:
=
=
=
(b)
The total amount of monthly expenses will be:
=
=
=
The slope<span> of a line is a number that measures its "steepness", usually denoted by the letter m. It is the change in y for a unit change in x along the line. Therefore, the slope of the line with the given points would be :
slope = (b - 0) / (a - 0) = b/a</span>