Type the correct answer in the box. Use sigma notation to represent the following series for the first 12 terms.
2 + (-8) + 32 + (-128) + ...

Is what I put correct ?!?

HURRYY please

The vertex of this parabola is at (-2,-3). when the x-value is -1, the y-value is -5. what is the coefficient of the squared expression in the parabola's equation?

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me