Answer:
-41
Step-by-step explanation:
arithmetic sequence formula:
where an = nth term , a1 = first term, n = # of terms and d = common difference
we want to find the 21st terms
The first term is -1 so a1 = -1
The number of terms is 21 so n = 21
and the common difference appears to be -2 because as the sequence goes on the number previous to it is subtracted by 2. eg. to get to -3 from -1 we subtract 2 ( -1 - 2 = -3) so d = -2
to find the 21st term we plug in the values of the variables
an = a1 + (n-1)d
a1 = -1 , n = 21 and d = -2
an = -1 + (21-1)(-2)
subtract 1 from 21
an = -1 + (20)(-2)
multiply -2 and 20
an = -1 + -40
add -1 and -40
an = -41
the 21st term would be -41
Answer:
a rotation followed by a translation
Step-by-step explanation:
i took the class last trimester
First find the area of the blue notebook by using the formula A=bh
A= 20×30 = 600 cm squared
Now find the area of the stickers using the same formula.
A=bh
A= 2 × 2 = 4 cm squared
Since there are 7 stickers then 4×7 = 28 cm squared is the area of all of them added together. Now simply subtract the area of the stickers from the area of the notebook to find how much of the notebook is still showing.
600 - 28 = 572 cm squared
The lengths of P,Q, and R are 6 ft 9 in, 11 ft 3 in and 15 ft 9
Tom would get £28.80
Sally would get £31.40
The difference is £2.60