I need the answer and explain please and thank you.

Mathematics

2 answers:

Dafna11 [192]3 years ago

6 0

Use cos sin and tan and looks up rules of cos sin tan and it will show you the rules and use those methods to plug into your equation

Aneli [31]3 years ago

4 0

Answer: 30°

Explanation: so we know line F has to be 180° because it’s a line. it tells us the angle is 140°, so we know the interior angle is 40° because 180°-140°=40°. we also know that a triangle is 180°. so we have the two angles of the triangle: 110° and 40°. to find the third angle we find 110°+40°+?=180°. once we solve, we know the third angle is 30° because 180°-150°=30°.

hope this helped!

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Find the indicated sum of each sequence S8 of -2,-13,-24,-35

valentina_108 [34]

Answer:

The sum of the arithmetic sequence is $S_{8}=-324$ .

Step-by-step explanation:

A sequence is a set of numbers that are in order.

In an arithmetic sequence the difference between one term and the next is a constant. In other words, we just add the same value each time infinitely.

If the first term of an arithmetic sequence is $a_1$ and the common difference is d, then the nth term of the sequence is given by:

$a_{n}=a_{1}+(n-1)d$

For the sequence

$-2,-13,-24,-35,...$

The pattern is continued by adding -11 to the last number each time.

An arithmetic series is the sum of an arithmetic sequence. We find the sum by adding the first, $a_1$ and last term, $a_n$ , divide by 2 in order to get the mean of the two values and then multiply by the number of values, n