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3 years ago

(-5)^2-2x(-9)+6 Please show work and step by step.

Mathematics

1 answer:

Varvara68 [4.7K]3 years ago

5 0

Answer:

Step-by-step explanation:

Use PEMDAS:

P Parentheses first

E Exponents (ie Powers and Square Roots, etc.)

MD Multiplication and Division (left-to-right)

AS Addition and Subtraction (left-to-right)

==============================================

(-5)² - 2 × (-9) + 6 first Exponents

25 - 2 × (-9) + 6 next Multiplication

25 + 18 + 6 next Addition

43 + 6 = 49

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A cross country runner Covers 2.5 miles in 12.5 minutes what is the runners average speed in miles per hour

stiks02 [169]

I believe the answer is 5 because if however many times you can multiply 2.5 into 12.5, you get the answer of 5.

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3 years ago

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Select all equations that have two solutions. a x^2=16 b 4x^2=0 c x^2=-16 d 3x+2=14 e x^2-1=24 f (x+8)(x-8)=0

never [62]

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a )

${x}^{2} = 16$

$x = ± \: 4$

Two solutions.

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b )

$4 {x}^{2} = 0$

$x = 0$

One solution .

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c )

${x}^{2} = - 16$

$No \: \: solution.$

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d )

$3x + 2 = 14$

$x = 4$

One solution.

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e )

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Two solutions.

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f )

$(x + 8)(x - 8) = 0$

$x = - 8 \: \: or \: \: x = 8$

Two solutions .

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2 years ago

Please help i'll mark brainliest if your answer is correct

amid [387]

Split the shape in 3 rectangles
4x2=8x2= 16 ( the bottom and top rectangle)
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6 0

3 years ago

I will give 80 points

faltersainse [42]

Answer:

8 home games and 10 away games

Step-by-step explanation:

Total home goals

= 8 +5 +9 +8 = 30

Number of home games

= 30/3.75 = 8

Total away game goals

= 7 + 8 + 4 + 5 = 24

Number of away games

= 24/2.4 = 10

Easy Peasy :) Hope this helped! <3 brainliest please :)

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2 years ago

The graph shows the relationship between the United States dollar and the euro, the currency of the European Union, in December

olasank [31]

The graph is missing, so i have attached it;

Answer:

Constant of proportionality = 0.75

Step-by-step explanation:

From the graph attached, we are given 3 coordinate points of (x, y) namely;

(120, 90), (250, 187.5), (400, 300)

Now, constant of proportionality for each coordinate point is simply;

k = y/x

Thus, for first coordinate point (120, 90),

k1 = 90/120

k1 = 0.75

For 2nd coordinate point (250, 187.5),

k2 = 187.5/250

k2 = 0.75

For third coordinate point (400, 300),

k3 = 300/400

k3 = 0.75

From each of the 3 points, we can see the constant of proportionality is the same and equal to 0.75.

6 0

3 years ago