MATHEMATICS MIDDLE SCHOOL

3x^2+4x-8=0 solve using Quadratic formula

Answers

Answer 1

Answer:

Answer: (-4+ 4√7)/6

Step-by-step explanation:

3x^2+4x-8 =0

Using formula method

-b+

Answer 2

Answer:

Answer:

x = (-2 ± 2√7) / 3

Step-by-step explanation:

x = [ -b ± √(b² − 4ac) ] / 2a

Here, a = 3, b = 4, and c = -8.

x = [ -4 ± √(4² − 4(3)(-8)) ] / 2(3)

x = [ -4 ± √(16 + 96) ] / 6

x = (-4 ± √112) / 6

x = (-4 ± 4√7) / 6

x = (-2 ± 2√7) / 3

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A circular pan has a diameter of 8 inches. What is the exact area of the pan?

A.

256π square inches

B.

8π square inches

C.

64π square inches

D.

16π square inches

Answers

You would divide the diameter in half to get the radius which is 4. And do the formula which is a=pie(r) squared. So the answer would be 50.24

Diameter of a circle = 2r
an area of a circle = πr²
so, if the diameter of the circular pan is 8 inches taht menas,
2r = 8
or, r = 4 inches
so area of the pan = πr² = 22/7* 4 = 12.57 inches

How many 20 make 88 dollars

Answers

Answer:

4.4 but that's not rational so 4 would most likely be your answer

Step-by-step explanation:

You can't make exactly 88 dollars with a certain number of 20 dollar bills. The closest you can get is 80.

A news report says that 28% of high school students pack their lunch. Your high school has 600 students. How many students in your high school would you expect to pack their lunch?

Answers

first you have 600., now remember where that decimal point is and move it one space to the right where you get 60.0, or 60. So 60 equals 10% of 600, with that you divide 60 by 10 where you get 6.0 and that is 2% of 600, with this info you multiply 6 by 8 and get 48, then you add 120 (because of the 20% which is 60×2) and you get your answer 168 students in your high school pack there lunch.

Answer

Find out the how many students in your high school would you expect to pack their lunch.

To prove

Let us assume that the number of student pack their lunch be x.

Formula

$Percentage = (Part\ value*100)/(Total\ value)$

As given

A news report says that 28% of high school students pack their lunch.

Your high school has 600 students.

Percentage = 28 %

Total value = 600

Part value = x

Put in the formula

$28 = (x*100)/(600)$

$x= (28*600)/(100)$

x = 168

Therefore 168 students pack their lunch .

Factor the. expression x^2+ 18x +80

Answers

Answer:

$(x + 10)(x+8)\n$

Step-by-step explanation:

Step 1: Factor

$x^2+10x+8x+80$

$(x + 10)(x+8)\n$

Answer: $(x + 10)(x+8)\n$

Step-by-step explanation:

x²+18x+80= 0

x²+10x+8x+80=0

x(x+10) +8(x+10)=0

(x+10)(x+8)=0

Cooper Worked 6 1/6 hours at the book fair. Amanda worked 4 5/6 hours at the book fair how much longer did Cooper work?

Answers

The number of hours that Cooper works will be 8/6 hours.

What is Algebra?

Algebra is the study of abstract symbols, while logic is the manipulation of all those ideas.

The definition of simplicity is making something simpler to achieve or grasp while also making it a little less difficult.

Cooper Worked 6¹/₆ hours at the book fair. Amanda worked 4⁵/₆ hours at the book fair.

⇒ 6¹/₆ - 4⁵/₆

⇒ 37/6 - 29/6

⇒ (37 - 29)/6

⇒ 8/6

The number of hours that Cooper works will be 8/6 hours.

More about the Algebra link is given below.

brainly.com/question/953809

#SPJ2

6 1/6 minus 4 5/6
= 5 7/6 minus 4 5/6
= 1 1/6 hours

47/10 as a mixed number

Answers

First, 10 goes into 47, 4 times.

4 is your whole number.

10 x 4 = 40

47 - 40 = 7

then put 7/10

Put them together and your answer will be (4 7/10)

The calculated fraction 47/10 to a mixed number is 4 7/10

How to change the fraction 47/10 to a mixed number

From the question, we have the following parameters that can be used in our computation:

Number = 47/10

Convert to a fraction

Number = 47/10

Divide 47 by 10

So, we have

Quotient = 4

Next, we have

Remainder = 47 - 4 * 10

Evaluate the products

Remainder = 7

So, we have

Fraction = 4 7/10

Simplify

Fraction = 4 7/10

Hence, the fraction to a mixed number is 4 7/10