All categories

2 years ago

How do i know when to add or subtract in an angle equation?

Mathematics

1 answer:

madam [21]2 years ago

7 0

Answer:

Step-by-step explanation:

< ABD = <ABC + < CBD

Substitute in what we are given

87 = 9x-1 + 6x+58

Combine like terms

87 = 15x +57

Subtract 57 from each side

87-57 =15x +57-57

30 = 15x

Divide by 15

30/15 =15x/15

2=x

We want to find <ABC

<ABC = 9x-1

= 9*2-1

=18-1

=17

You might be interested in

Help!!!!!!!!!!!!!!!!!

irina [24]

We need to see the exercise before that or we cant solve it!

4 0

2 years ago

I trying to reduce But I don't know how can someone help me please thanks!

meriva

-- Avoid foods high in fat. -- Keep hydrated. -- Get serious with fruit, vegetables, and exercise.

3 0

3 years ago

Read 2 more answers

A triangular plaque has side lengths of 8 inches, 13 inches, and 15 inches.

lianna [129]

<h3>Answer: A) 52 square inches</h3>

==========================================================

Explanation:

a = 8, b = 13, and c = 15 are the sides of the triangle

s = (a+b+c)/2 = (8+13+15)/2 = 18 is the semi-perimeter, aka half the perimeter.

Those values are then plugged into Heron's Formula below

$A = \sqrt{s*(s-a)*(s-b)*(s-c)}\\\\A = \sqrt{18*(18-8)*(18-13)*(18-15)}\\\\A = \sqrt{18*(10)*(5)*(3)}\\\\A = \sqrt{2700}\\\\A = \sqrt{900*3}\\\\A = \sqrt{900}*\sqrt{3}\\\\A = 30\sqrt{3}\\\\A \approx 51.9615\\\\A \approx 52\\\\$

The triangular plaque has an area of approximately 52 square inches.

6 0

2 years ago

10 POINTS! <br> Find x and y.

ki77a [65]

Step-by-step explanation has been given below.....pls check the attachment.

PLS MARK AS BRAINLIEST!!!

HAPPY ANSWERING!!

HOPE IT HELPS YOU!!

6 0

3 years ago

Write the equation of a line perpendicular to y=7 that passes through (2,13)

Dovator [93]

The equation should be X=2

7 0

2 years ago