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4 years ago

Find the roots of 2x2-5x+9=0

Mathematics

1 answer:

andrew11 [14]4 years ago

6 0

Step-by-step explanation:

2×2-5x+9=0

4+9-5x=0

13-5x=0

√(13-5x)^2 =0

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(i need help quikly pls! ) Zuri earned $56.80 at his job last week. They then spent $40 on a video game. 56.80+(−40)=16.80. Inte

Ratling [72]

$16.80 is how much more Zuri needs to purchase another video game.

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2 years ago

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The length of each side of an equilateral triangle is 74mm, correct to the nearest millimeter. Calculate the smallest possible p

Olin [163]

Answer:

221 mm

Step-by-step explanation:

The dimension 74 mm is presumed to mean that the actual length could be anywhere in the interval [73.5, 74.5). So, the minimum perimeter is ...

3 × 73.5 = 220.5 ≈ 221 . . . millimeters

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The perimeter of an equilateral triangle is 3 times the side length, since all three sides of the triangle are the same length.

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3 years ago

Which system or equation is represented in the graph?

melamori03 [73]

Answer:

$(A)\displaystyle \begin{array} {ccc} \displaystyle y = - 2 \\ x - 2y = 6\\ \end{array}$

Step-by-step explanation:

<h3>Equation of the blue line:</h3>

since the line is horizontal and passes <u>-</u><u>2</u> the equation of the blue line should be

$\displaystyle \large y = - 2$

<h3>Equation of the red line:</h3>

remember The form of equation of a line

$\displaystyle \boxed{ \displaystyle y = mx + b}$

where m is slope of the line and b is the y-intercept we can clearly see that the red line crosses y-axis at (0,-3) therefore b=-3

to figure out m we can consider the following formula:

$\displaystyle m = \frac{ \Delta y}{ \Delta x}$

from the graph we acquire ∆y=1 and ∆x=2

thus substitute:

$\displaystyle m = \frac{ 1}{ 2}$

so we have figured out m and b

therefore our equation of blue line is

$\displaystyle y = \frac{1}{2} x - 3$

our given options are in standard form so

move -3 to left hand side and change its sign:

$\displaystyle y + 3= \frac{1}{2} x$

cross multiplication:

$\displaystyle 2y + 6= x$

move 6 to right hand side and x to left hand side and change its sign

$\displaystyle - x + 2y = - 6$

multiply both sides by -1:

$\displaystyle x - 2y = 6$

hence, our system of linear equation is

$\displaystyle \begin{cases} \displaystyle y = - 2 \\ x - 2y = 6\\ \end{cases}$

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3 years ago

WILL GIVE MEDAL AND FAN! you invest $5,175.00 in a stock plan. it increases 9% the first year and then loses 5% of it's value th

Ne4ueva [31]

5,175 + 9% = <span>5640.75

</span>5640.75 - 5% = <span>5302.305
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Subtract them both and get = <span>127.305</span>

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3 years ago

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The area of a rectangle is 99in. The length of the rectangle is 2 in. Longer than the width. What is the width of the rectangle?

never [62]

(2+w)w=99

2w+w^2=99

w^2+2w-99=0

(w-9)(w+11)=0

W=9 w=-11

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3 years ago