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2 years ago

I need help!il give brainlest

Mathematics

1 answer:

klasskru [66]2 years ago

6 0

Answer:

C. 9 9 9 12 Im pretty sure. ..

btw sorry if its wrong :(

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1. We want to know how much money Houston people would like to spend on

MAXImum [283]

I think it’s 500 volunteers

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3 years ago

Solve this equation for x: 2x^2 + 12x - 7 = 0

zhannawk [14.2K]

Answer:

x=0.5355 or x=-6.5355

First step is to: Isolate the constant term by adding 7 to both sides

Step-by-step explanation:

We want to solve this equation: $2x^2 + 12x - 7 = 0$

On observation, the trinomial is not factorizable so we use the Completing the square method.

Step 1: Isolate the constant term by adding 7 to both sides

$2x^2 + 12x - 7+7 = 0+7\\2x^2 + 12x=7$

Step 2: Divide the equation all through by the coefficient of $x^2$ which is 2.

$x^2 + 6x=\frac{7}{2}$

Step 3: Divide the coefficient of x by 2, square it and add it to both sides.

Coefficient of x=6

Divided by 2=3

Square of 3= $3^2$

Therefore, we have:

$x^2 + 6x+3^2=\frac{7}{2}+3^2$

Step 4: Write the Left Hand side in the form $(x+k)^2$

$(x+3)^2=\frac{7}{2}+3^2\\(x+3)^2=12.5\\$

Step 5: Take the square root of both sides and solve for x

$x+3=\pm\sqrt{12.5}\\x=-3\pm \sqrt{12.5}\\x=-3+ \sqrt{12.5}, $ or $x= -3- \sqrt{12.5}\\$x=0.5355 or x=-6.5355$

6 0

3 years ago

At a children's concert there were 80 boys. There were 1 1/2 times the number of girls as boys. What percentage of the total num

beks73 [17]

Answer:

60% are girls

Step-by-step explanation:

80 x 1.5 = 120 which is the amount of girls

120 out of 200 is 12/20 or 3.5 which is 60%

4 0

3 years ago

Can anybody please help me show my work for these problems....I have the correct answer just no work to prove it...

Nikitich [7]

I hope this helps you

5 0

3 years ago

Read 2 more answers

Andy is hanging wallpaper in his kitchen. He is able to cover 2 2/5 of the walls in the room using 6 rolls of wallpaper. What is

faltersainse [42]

Answer: The number of rolls of paper is $2\dfrac{1}{2}$ .

Step-by-step explanation: Given that Andy is hanging wallpaper in his kitchen. 6 rolls of wallpaper is used to cover $2\dfrac{2}{5}$ of the walls.

We are to find the number of rolls of paper used per wall.

We will be using unitary method to solve the given problem.

We have,

$2\dfrac{2}{5}=\dfrac{12}{5}.$

Now, number of rolls used to cover $\dfrac{12}{5}$ of the walls = 6.

Therefore, number of rolls used to cover 1 wall is given by

$\dfrac{6}{\frac{12}{5}}=\dfrac{5\times 6}{12}=\dfrac{5}{2}=2\dfrac{1}{2}.$

Thus, $2\dfrac{1}{2}$ rolls of paper used per wall.

3 0

3 years ago

Read 2 more answers