4 years ago

WILL MARK YOU BRAINLIEST

Mathematics

2 answers:

NeTakaya4 years ago

8 0

Answer 33

Step-by-step explanation:

harina [27]4 years ago

8 0

A triangle’s angles will add to 180
(2x-33)+(2x+15)+2x=180

Add like terms
6x-18=180

Isolate the X
6x =198
x=33

Check answer
2(33)= 66
2(33)+15= 81
2(33)-33 =33
66+81+33=180
x=33

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3 years ago

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Answer:

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Step-by-step explanation:

Give:

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3 years ago

The first term of an Ap is - 504 while<br>the sum of its 9 terms is-126 find<br>Sum of its 30 terms

frozen [14]

Answer:

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Step-by-step explanation:

Given:

The First term in the AP is -504

The Sum of its 9 terms is -126

To Find:

The sum of its 30 terms = ?

Solution:

The sum of n terms of an AP:

$S_n = (\frac{n}{2} ) [ 2 a_1 + ( n - 1 ) d ]$

The sum of 9 terms of an AP:

$S_9 = (\frac{9 }{2} ) [ 2(-504) + ( 9 - 1 )d ]$

$S_9 = (4.5 )[ 2 (-504)+ ( 8 ) d ]$

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3 years ago

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