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3 years ago

7

Help a girl out pls

1 answer:

Marta_Voda [28]3 years ago

3 0

Answer:

1 ± sqrt(17)

x = ---------------------------

2

Step-by-step explanation:

x^2 - x - 4 =0

Using the quadratic equation

-b ± sqrt(b^2 -4ac)

x = ---------------------------

2a

Where ax^2 +bx +c

We know a =1 b = -1 c = -4

-(-1) ± sqrt((-1)^2 -4(1)(-4))

x = ---------------------------

2(1)

1 ± sqrt(1 +16)

x = ---------------------------

2

1 ± sqrt(17)

x = ---------------------------

2

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Each output value is equal to the square of the input value minus<br> five

Ivenika [448]

i think that A pair of an input value and its corresponding output value is called an ordered pair and can be written as (a, b). In an ordered pair the first number, the input a, corresponds to the horizontal axis and the second number, the output b, corresponds to the vertical axis.

We can thus write our values as ordered pairs

(0, 0) - This ordered pair is also referred to as the origin

(1, 2.5)

(2, 5)

(3, 7.5)

These ordered pairs can then be plotted into a graph.

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2 years ago

Which number is a solution to the inequality? m > 2/3

andrew11 [14]

C. 1
It's because 2/3 is equal to 0.6666667
1 is the only greater than that since they're all negative options

4 0

3 years ago

2) Brian purchased pens for 75 cents each and pencils for 40 cents each he bought total of 22 writing utensils for $11.95. How m

d1i1m1o1n [39]

Answer:

13 pencils.

Step-by-step explanation:

Let x be the pens and y be the pencils

Given:

Brian purchased pens for 75 cents each and pencils for 40 cents each he bought total of 22 writing utensils for $11.95.

Total pens and pencils is 22

So, $x+y=22$ ----------------(1)

And he bought all utensils for $11.95. and each pen for 75 cents and pencils for 40 cents.

$0.75x+0.40y=11.95$ ------------(2)

solve equation 1 and equation 2 for x and y.

From equation 1.

$x+y=22$

$y=22-x$ ----------------(3)

put y value in equation 2.

$0.75x+0.4(22-x)=11.95$

$0.75x+0.4\times 22-0.4x=11.95$

$0.75x+8.8-0.4x=11.95$

$0.75x-0.4x=11.95-8.8$

$0.35x=3.15$

$x=\frac{3.15}{0.35}$

$x=9$

Now substitute x value in equation 3.

$y=22-9$

$y=13$

So, he buy 13 pencils.

5 0

3 years ago

Darius buys a bottle of a chemical solution that contains 70% alcohol. The bottle contains 500 milliliters of solution.

Andru [333]

Answer:

350 ml

Step-by-step explanation:

70% of 500 ml = 0.7*500 ml = 350 ml

6 0

3 years ago

Read 2 more answers

|x+5|+20=4 Needs to show work on how you came up with the answer.

arlik [135]

Answer:

No solution

Step-by-step explanation:

So we have the equation:

$|x+5|+20=4$

First, subtract 20 from both sides:

$|x+5|=-16$

Now, we can stop. Recall that absolute value will always <em>always</em> give a positive answer.

Since this equals -16, this means that there is no solution.

And we're done!

5 0

2 years ago