Answer:
Now, Mr Lee's age is 40 years, his son's age is 13 years.
Step-by-step explanation:
<u>4 years ago:</u>
Son's age = x years
Mr. Lee age = 4x years
<u>Now:</u>
Son's age = x + 4 years
Mr. Lee age = 4x + 4 years
The sum of the ages of Mr Lee and his son is 53 now, so

Now, Mr Lee's age is 40 years, his son's age is 13 years.
Answer:
option A is correct. this graph is a linear function
Step-by-step explanation:
Linear functions are those whose graph is a straight line. A linear function has one independent variable and one dependent variable. The independent variable is x and the dependent variable is y. a is the constant term or the y intercept
The set contains the values of x between 7 and 10. If x is an integer, it contains 8 and 9
The density of silver is 10,500 kg/m^3, therefore the
volume of a 2.90 kg silver is:
V = 2.90 kg / (10,500 kg/m^3)
V = 0.000276 m^3
We know that volume is simply area times height:
Volume = Area * height
SO the area is:
Area = 0.000276 m^3 / 3.00 x 10-7 m
<span>Area = 920.63 m^2</span>
Express the matrix
like
, where
if
and
if
. (
is known as kronecker's delta)
In the same form we express the matrix
.
The firs index indicate the row and the second the column.
By the multiplication of matrices we have
, where

because only
is non-zero in the last sum.
therfore we have
.
In the same manner we have
, where

And so, 