What value of x makes the equation true? 1.4x+2.6x=−16

x=−4

x=−13

x=−19

x=−48

A.) x = -4

Step-by-step explanation:

1. Simplify the expression

1.4x + 2.6x = -16

Simplify the arithmetic:

4x = -16

2. Isolate the x

4x = -16

Divide both sides by 4:

=

Simplify the fraction:

x =

Find the greatest common factor of the numerator and denominator:

x =

Factor out and cancel the greatest common factor:

x = -4

A.) x = -4

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1. 180°. the sum of the interior angles of a triangle is 180°, for the equilateral triangle that it has three equals side is 60°+60°+60°=180°.

2. 60°. each interior angle of a equilateral triangle is 60°

3. 120°. the measure of ∠m is 120°, the sum of the angles ∠m and ∠n is equal to 180°. so, in order to find the measure of ∠m, we have ∠m+∠n=180° > ∠m=180°-∠n > ∠m=180°-60°=120°.

4. 360°. the sum of the exterior angles of an equilateral triangle is ∠m+∠r+∠x=120°+120°+120°=360°. the exterior angles of any triangle always add 360°.