Answer:
I think it would be C.
Step-by-step explanation:
One is positive Four is negative so is 1+(-4)
First do (30×20)/2 + 20×25 + 35×42 + (42×25)/2
it should give you a total of 2795 cm
Answer:
b
Step-by-step explanation:
Answer:
9 + 3 + 1 + ......... = 13.5
Step-by-step explanation:
The series 9 + 3 + 1 + is the sum of an infinite geometric sequence. The first term of the series is 9 while the common ratio is 1/3;
to obtain the common ratio we obtain the quotient of any two successive terms, 3/9 or 1/3.
The sum of an infinite geometric series with first term a and common ratio r is given by;

Plug in the values of a and r into the formula;
