Save 20.80 ill take it best answer me!
Answer:
The explicit rule for the arithmetic sequence is given by:
......[1]
where,
is the first term
n is the number of terms and
d is the common difference for two consecutive terms.
As per the statement:
A recursive rule for an arithmetic sequence is:


The recursive formula for the arithmetic sequence is given by:

then;
On comparing we get;
d = -3
Substitute the given values in [1] we have;

⇒
Therefore, the explicit rule for this sequence is, 
Answer:
The area of the shaded region is: 32.25m^2
Step-by-step explanation:
Given
See attachment for rectangle and semicircles
Required
The shaded region
We have:
--- length of the rectangle
This means that the diameters of the three circles add up to 30m.
So, the diameter of 1 is:



The area of one circle is:




The area of the three circles is:



The area of the rectangle is:

Where r is the radius of the circle
And



So, we have:



So, the shaded region is:



Count by ones from 392 to 500ok done
im not about to write all that out