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2 years ago

Find the value of this expression if X = -1 and Y = -5 xy over -6

Mathematics

1 answer:

Thepotemich [5.8K]2 years ago

4 0

$\frac{xy}{-6} = \frac{(-1)(-5)}{-6} = \frac{5}{-6} = -\frac{5}{6}$

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Please show me how to solve for Xsquared - 21.75X = -15.75. I have the solution but do not know how to solve it.

Andreas93 [3]

$x^2-21.75x=-15.75 \\
x^2-21.75x+15.75=0$

Use the quadratic formula:
$x^2-21.75x+15.75=0 \\ \\
a=1 \\ b=-21.75 \\ c=15.75 \\ b^2-4ac=(-21.75)^2-4 \times 1 \times 15.75=473.0625-63=410.0625 \\ \\
x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}=\frac{-(-21.75) \pm \sqrt{410.0625}}{2 \times 1}=\frac{21.75 \pm 20.25}{2} \\
x=\frac{21.75-20.25}{2} \ \lor \ x=\frac{21.75+20.25}{2} \\
x=\frac{1.5}{2} \ \lor \ x=\frac{42}{2} \\
x=\frac{15}{20} \ \lor \ x=21 \\
x=\frac{3}{4} \ \lor \ x=21 \\
\boxed{x=\frac{3}{4} \hbox{ or } x=21}$

3 0

3 years ago

Simplify this equation, 12x+7x+8y+12^2+y+12=

soldi70 [24.7K]

12x+7x+8y+12^2+y+12=19x+9y+24^2

5 0

3 years ago

Read 2 more answers

The perimeter of a rectangle is 32 inches. The length is 1 foot. What is the width of the rectangle in inches? A. 4 inches B. 10

alekssr [168]

Answer:

A. 4 inches

Step-by-step explanation:

Applying,

P = 2(L+W)............. Equation 1

Where P = Perimter of the rectangle, L = Length of the rectangle, W = width of the rectangle.

make W the subject of the equation

W = (P/2)-L............ Equation 2

From the question,

Given: P = 32 inches, L = 1 foot (Convert from Foot to inches), L = 12 inches

Substitute these values into equation 2

W = (32/2)-12

W = 16-12

W = 4 inches.

Hence the right option is A.

6 0

3 years ago

The graph shows the relationship between the number of granola bars and amount of calories per bar.

castortr0y [4]

part a y= x × 100

Step-by-step explanation:

1 bar is 100 calories so you would times it by 100 for every bar

5 0

2 years ago

Jim needs to run at least 45 miles this week for training, If he has already run 17 miles, how many miles should he

Neporo4naja [7]

Answer:

7 miles

Step-by-step explanation:

45 - 17 = 28 miles

28 : 4 = 7 miles

8 0

2 years ago