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2 years ago

Will get brainliest!!!!! Will report bots

Mathematics

2 answers:

Klio2033 [76]2 years ago

8 0

Answer:

x^2+x-20=0

x^2+5x-4x-20=0

x(x+5)-4(x+5)=0

(x+5)(x-4)=0

Thereforex=-5 ,x=4

NeX [460]2 years ago

7 0

Answer:

x= -5 or x=4

Step-by-step explanation:

Lets first turn this into quadratic formula form

(-1 ± $\sqrt{1^2-4*1*-20}$ ) / 2

(-1 ± 9 )/2

-10 / 2 =x or 8/2 =x

x= -5 or x=4

It was hard to type it in the comments hope this helped

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3 years ago

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3 years ago

What is the solution to log (9x)-log 3 = 3?

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Answer:

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Step-by-step explanation:

Step 1:-

Given $log(9 x) -log 3 =3$

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3 years ago

During a test period, an experimental group of 10 vehicles using an 85 percent ethanol-gasoline mixture showed mean CO2 emission

Zinaida [17]

Answer:

-1.683

Step-by-step explanation:

Given :

Group 1 :

x1 = 667 ; n1 = 10 ; s1 = 20

Group 2 :

x2 = 679 ; n2 = 14 ; s2 = 15

The test statistic assuming equal variance :

x1 - x2 / √[Sp² * (1/n1 + 1/n2)]

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Test statistic =

(667 - 679)/ √[296.59 * (1/10 + 1/14)]

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Test statistic = - 1.682

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2 years ago