Remove parantheses, subtract and solve using quadratic formulae
Ill give brainlest if correct
2 answers:
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Answer:
Step-by-step explanation:
The formula for the first n terms of an arithmetic sequence is
Sₙ = n(a₁+ aₙ)/2
1. Find the number of terms
n = (124 - 45) + 1 = 79 + 1 = 80
2. Find the sum
a₁ = 45
a₈₀ = 124
Step-by-step explanation:
At first you need to take its lateral surface area by using the perimeter of base of the triangle and the height of prism.
Then after calculating it you need to find out its total surface area which is asked in the question and that is calculated by adding the area of both triangles of the prism in the lateral surface area.
Then that's your answer.
