Answer:
45
Step-by-step explanation:
using similar triangles
Let x be the boy's height
=
cross multiply to get 43.2x=1944
then divide by 43.2 both sides
to get x=45
y=-4x-16
Step-by-step explanation:
Answer:
a = 6
Step-by-Step Explanation:
9 + 8a = 57
8a = 57 - 9 (subtract 9 from both sides)
8a = 48 (then divide 8 from both sides to get "a" alone)
a = 48/8
a = 6
Answer:
17.8
Step-by-step explanation:
First:
put the equation together
(2x+3) * (x+2)=91
Secondly:
condense
parenthisis can be dropped and normal problem solving can be used.
5x+2=91
subtract 2 from either side of the =
this will give you 5x=89
next divide 5 from each side because it is multiplying the x
x=17.8
Answer:
Follows are the solution to the given points:
Step-by-step explanation:
The value is attached in the image file please find it.
In point a:
First, we calculate the find the mean,
Formula:


To calculate the standard deviation, subtract the mean value from all observations then square its value:


please find attached file
In point b:
New 
Calculate new mean:


calculating the standard deviation:


please find attached file
In point C:
Calculate new mean:


calculating the standard deviation:


please find attached file
In point d:
for b,
New 
New
for c,
New
New 