Answer: -7
Step-by-step explanation:
Answer:
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Step-by-step explanation:
Answer:
y = 105°
Step-by-step explanation:
In an isosceles trapezoid
• Any lower base angle is supplementary to any upper base angle
• The lower base angles are congruent
75 and x are supplementary, thus
x = 180° - 75° = 105°
x and y are lower base angles and congruent, so
y = x = 105°
Answer:
-385
Step-by-step explanation:
Perhaps you want the sum of 10 terms of the arithmetic sequence ...
-16, -21, -26, ..., -61
The sum of any arithmetic sequence is the average term multiplied by the number of terms. The average term is the average of the first and last terms. Here, that is ...
((-16-61)/2)(10) = -385