Evaluate the geometric series. Help me!!

255

Step-by-step explanation:

The n th term of a geometric series is

= a

where a is the first term and r the common ratio

1 ← is the n th term

with a = 1 and r = 2

The sum to n terms of a geometric series is

= , thus

=

    = - 1 = 256 - 1 = 255

10a^3+277a^2-132a-792

step-by-step explanation:

(2a+11)(5a-12)(foil)

=10a^2-24a+55a-132 =10a^2+31a-132

(10a^2+31a-132)(a+6)

=10a^3+60a^2+31a^2+186a^2-132a-792 =10a^3+277a^2-132a-792

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