shanasia76
21.09.2020 •
Mathematics
Find the 1st term of a sequence if the common difference = -2 and the 13th term =59
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Ответ:
83
Step-by-step explanation:
Formula for 13th term:
t(13) = a + 12d, where a- first term, d- common difference
Given
t(13) = 59d = -2a = ?As per the formula for 13th term:
59 = a + 12*(-2)59 = a - 24a = 59 + 24a = 83Ответ:
Add all the sides up to equal 30 in an equation because you are given the perimeter. The perimeter is the length around a two dimensional shape. This means the perimeter is the length of all the side lengths added together.
(x) + (2x + 2) + (13) = 30
Combine like terms.
3x + 15 = 30
Subtract 15 from both sides.
3x = 15
Divide both sides by 3.