Solve for 19a - 12-4a=-57

Mathematics

2 answers:

Zielflug [23.3K]4 years ago

3 0

Answer:

a=-3

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AlexFokin [52]4 years ago

3 0

A= 3

Hope it helps
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The ratio of the measure of the vertex angle to the base angle of an isosceles triangle is 8:5. Find the measure of the vertex a

Pie

Answer:

Step-by-step explanation:

The two base angles are equal.

The vertex angle is 8x

The two base angles are 5x + 5x

The sum of all three angles = 180 degrees (all triangles make 180 degrees when their interior angles are added).

5x + 5x + 8x = 180

18x = 180

x = 180/18

x = 10

Therefore the vertex angle is 8*10 = 80 degrees

One of the base angles = 10* 5 = 50 degrees

The other base angle = 50 because the triangle is isosceles.

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2 years ago

What is a polygon that is sometimes regular

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3 years ago

suppose that the water level of a river is 34 feet and that it is receding at a rate of 0.5 foot per day. Write an equation for

lubasha [3.4K]

Equation: L= -0.5D+34.

The water level be 26 feet in 16 days.

<u>Step-by-step explanation:</u>

Let us consider the initial level (x=0) of the water is 34 feet. Then its coordinate point can be written as (0,34).

The water is receding at the rate 0.5 feet per day, which given us the information that 0.5 is the slope since it is the rate of change and it is decreasing so it is a negative slope.

⇒m= -0.5.

The line equation is y = mx+c. Let us rewrite as L= mD+c.

Where L is the level of water(y-axis) and D is the days(x-axis) and c is y-intercept.

⇒L= (-0.5)D+c.

To find y-intercept, substitute (0,34) (the known point from the graph) in the equation. Also, the point in y axis when x=0 is y-intercept.

34= (-0.5)(0)+c.

c=34.

∴L= (-0.5)D+34.

To find the days when the water achieves level as 26 feet:

26 = (-0.5)D+34.

26-34= (-0.5)D.

-8 = (-0.5)D.