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2 years ago

Use the quadratic formula to solve 2y2 + 6y – 8 = 0.

Mathematics

1 answer:

Margaret [11]2 years ago

4 0

Y = [-6 +/- sqrt(6^2 -4*2*-8)] / 2*2
= (-6 +/- sqrt 100) / 4
= (-6+10) / 4 , (-6-10) / 4
= (1 , -4)

the answer is C

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Which expressions are equivalent to 4^-2 times 7^-2

Harlamova29_29 [7]

Step-by-step explanation:

$= {4}^{ - 2} \times {7}^{ - 2}$

$= {(4 \times 7)}^{ - 2}$

$= {28}^{ - 2}$

$= \frac{1}{ {28}^{2} }$

7 0

2 years ago

Which graph represents the function of f(x) 9x^2 + 9x - 18 / 3x + 6

Irina-Kira [14]

Answer:

The graph in the attached figure

Step-by-step explanation:

we have

$f(x)=\frac{9x^{2}+9x-18}{3x+6}$

Remember that in a quotient, the denominator cannot be equal to zero

The value of x cannot be equal to x=-2

Simplify the expression

Using a graphing tool

The roots of the quadratic equation in the numerator are

x=-2 and x=1

$9x^{2}+9x-18=9(x+2)(x-1)$

Simplify the denominator

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

substitute in the original expression

$f(x)=\frac{9(x+2)(x-1)}{3(x+2)}$

Simplify

$f(x)=3(x-1)$

$f(x)=3x-3$

Is the equation of a line

The y-intercept is the point (0,-3) (value of the function when x is equal to zero)

The x-intercept is the point (1,0) (value of x when the value of the function is equal to zero)

Graph the line, but remember that the value of x cannot be equal to -2

The graph in the attached figure

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2 years ago

A 45-45-90 triangle has legs of length 3√2

qwelly [4]

Answer:

Step-by-step explanation:

the hypotenuse should be 3√2*√2=6

4 0

2 years ago

Brainlist answer!!Can I get some help with this, please!!

Gemiola [76]

A) The question would be "Does cell phone use time correlate to brain cancer?". The population is all cell phone users. The sample is the 469 people with brain cancer, and the 422 healthy people.

B) This sample size may not portray the entire population of users because the positive results may have been fabricated by factors other than cell phone use. You would have to figure out the population size and determine the correct sample size.

C) This study may not portray cell phone use correlation over a large population efficiently because of the sample size and the predetermined conclusion that cell phone use causes cancer.

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2 years ago

If y varies inversely as x, and y = 10 when x = 20,<br> find x when y = 16.

Ipatiy [6.2K]

Answer:

12.5

Step-by-step explanation:

y varies inversely as x.

y = k/x

10 = k/20

200 = k

The constant proportion k is 200.

16 = 200/x

Cross multiply.

200 = 16x

200/16 = x

x = 12.5

5 0

2 years ago