Find the sum of the geometric sequence -3,15,-75,375,... when there are 9 terms

-976,563.

Step-by-step explanation:

The common ratio is 15/-3 = -75/15 = 375/-75 = -5.

Sum of n terms = a1. (r^n - 1) / (r - 1)

so S9 = -3 * ((-5)^9 - 1)) /  (-5 - 1)

= -976,563.

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°

answer:

step-by-step explanation:

here, the total dishes = 10

dishes having meat = 3 ( chicken, meatloaf and hamburger )

thus, the probability of having meat on the chosen dishes = number of dishes having meat / total dishes

=

therefore, the probability of not having meat = 1- the probability of having meat on the chosen dishes

=

=

=

⇒ option b is correct.