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2 years ago

Solve for the value of a. . (9a+6° 750

Mathematics

1 answer:

Lilit [14]2 years ago

8 0

As you can see those two angles are supplementary which the sum of two angles = 180°

So,

(9a + 6) + 75 = 180

Subtract 75 on both sides:

9a + 6 = 105

Subtract 6 on those sides:

9a = 99

Divide 9 on both sides:

a = 11

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Solve quadratic equation 10x^2+x-2=0

zhuklara [117]

Answer:

$\{-\frac{1}{2} \} \cup \{\frac{2}{5}\}$

Step-by-step explanation:

$10x^2 + x - 2 = 0; \\ a = 10, b = 1, c = -2; \\ D = b^2 - 4ac = 1^2 - 4 * 10 * (-2) = 1 + 80 = 81 = 9^2, > 0; \\ x_{1, 2} = \frac{-b \pm \sqrt{D}}{2a} = \frac{-1 \pm \sqrt{9^2}}{2 * 10} = \frac{-1 \pm 9}{20} = \left \ [ {{\frac{-1 - 9}{20} = -\frac{10}{20} = -\frac{1}{2} } \atop {\frac{-1 + 9}{20} = \frac{8}{20} = \frac{2}{5}}} \right.$

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2 years ago

A vehicle is traveling at a rate of 80 kilometers per hour. How many miles per hour is this?

Rudik [331]

Answer:

49.71 miles per hour

Step-by-step explanation:

The speed of the vehicle is at a rate of 80 kilometers per hour.

Convert km to miles.

80 kilometers = 49.7097 miles

The speed is approximately 49.71 miles per hour.

8 0

3 years ago

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Select or < > = to correctly classify each inequality. <br> -2/3 ___ 2/3<br> 1.4___ 1.6

Paul [167]

I hope this helps you

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3 years ago

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What is the value of x?

RSB [31]

An exterior angle equals the sum of the remote interior angles .

x + 60 = 95

x = 95 - 60

x = 35

Answer

B. 35

7 0

3 years ago

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Misha wrote the quadratic equation 0=-x2+4x-7 in standard form. what is the value of c in her equation

Masteriza [31]

Answer:

Final answer is c=-7.

Step-by-step explanation:

Given equation is $0=-x^2+4x-7$ .

Now question says that Misha wrote the quadratic equation 0=-x2+4x-7 in standard form. Now we need to find about what is the value of c in her equation.

We know that standard form of quadratic equation is given by $ax^2+bx+c=0$ .

compare given equation with the standard form, we find that -7 is written in place of +c

so that means +c=-7

or c=-7

Hence final answer is c=-7.

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3 years ago