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3 years ago

Find the value of x. 3x +7 D 2x + 7 3x 16

Mathematics

2 answers:

Mashcka [7]3 years ago

7 0

Answer:

sum of interior angle of a triangle is 180 degree

so,

3x +7 + 2x+7 +3x+6 = 180

8x + 20 = 180

8x = 180 - 20

8x = 160

x = 160/ 8

x = 20

May it will help you

evablogger [386]3 years ago

5 0

Answer:

x = 20

Step-by-step explanation:

According to angle sum property of a triangle , sum of all the angles in a triangle is equal to 180°.

So,

$(3x + 7) + (2x + 7) + (3x + 6) = 180$

$= > 8x + 20 = 180$

$= > 8x = 180 - 20 = 160$

$= > x = \frac{160}{8} = 20$

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Answer:

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Step-by-step explanation:

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Sonja [21]

Answer:

$\boxed {m = -6}$

Step-by-step explanation:

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3 years ago

By what percent will a fraction decrease if its numerator is decreased by 85% and its denominator is decreased by 25%??

belka [17]

Answer:

106.67%

Step-by-step explanation:

85% as a fraction is 4/5

25% as a fraction is 3/4

Convert 16/15 to a decimal: 1.067

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3 years ago

Determine the type and number of solutions of −4x2 − 3x + 7 = 0.

Kaylis [27]

Answer:

Step-by-step explanation:

You have to use the discriminant for this. If the quadratic is $-4x^2-3x+7$ , then

a = -4, b = -3, and c = 7. The formula for finding the discriminant is

$D=b^2-4ac$ which comes from the quadratic formula, but without the square root sign. Filling in:

$D=(-3)^2-4(-4)(7)$ which simplifies down to

D = 9 + 112 so

D = 121. This is a perfect square, so the solutions will be 2 real. Just so you know, you will NEVER have a solution like the one offered in the third choice down. If you have one imaginary root, you will ALWAYS have a second by the conjugate rule.

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3 years ago