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kati45 [8]
3 years ago
8

20. The Christmas cheer from the crowd singin

Mathematics
1 answer:
Y_Kistochka [10]3 years ago
7 0

Answer:

the answer is 4/5 because 4 divided by 5 is .80. multiply the .80 by 100 to get 80%

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Rectangle has an
liq [111]

The positive value for x is 7

Explanation:

Given that the area of a rectangle is expressed by 2x^2-7x-4

The area of the rectangle is 45.

We need to determine the positive value for x.

<u>The value for x:</u>

The value of x can be determined by equating both the values of area of a rectangle.

Thus, we have,

2x^{2} -7x-4=45

Subtracting both sides by 45, we have;

2x^{2} -7x-49=0

Let us solve the equation using the quadratic formula.

Thus, we get;

x=\frac{-(-7) \pm \sqrt{(-7)^2-4(2)(-49)}}{2(2)}

Simplifying, we get;

x=\frac{7 \pm \sqrt{49+392}}{4}

x=\frac{7 \pm \sqrt{441}}{4}

x=\frac{7 \pm 21}{4}

Thus, the two values of x are given by

x=\frac{7 + 21}{4}   and   x=\frac{7 - 21}{4}

x=\frac{28}{4}   and   x=\frac{-14}{4}

x=7   and   x=-\frac{7}{2}

Since, x cannot take negative values, then x=7

Thus, the value of x is 7.

4 0
3 years ago
Simplify the expression. 4+9⋅2÷3−1 8 9 12 77
vredina [299]

Answer:

9

Step-by-step explanation:

Order of Operations: BPEMDAS

Step 1: Write out expression

4 + 9(2)/3 - 1

Step 2: Multiply

4 + 18/3 - 1

Step 3: Divide

4 + 6 - 1

Step 4: Add

10 - 1

Step 5: Subtract

9

3 0
3 years ago
andy has 9 math books and 6 reading books if he wants to distribute them evenly among some bookshelves so that each has the same
Musya8 [376]
Divide it up by 5 because 9+6=15

Or u could divide it up by 3
5 0
3 years ago
Hello! Could anyone help me with this as I really don’t have a clue on what to do
lakkis [162]

Answer:

1. 1.4

2. -0.3

3. 0.4

4. -3.2

Step-by-step explanation:

use the quadratic formula to find x intercepts

7 0
2 years ago
How do I do this problem??
KiRa [710]
First find the difference of the numerator. to do this multiply 1/x by 2 and 1/2 by x. you should get (2-x)/2x. now moving on to the whole fraction. then multiply the (2-x)/2x by 2x and the (x-2) by 2x. you should get (2-x)/(2x)(x-2). now factor out a negative from the (x-2) at the denominator to get -(2-x). so now you can cancel the (2-x) from the numerator and denominator! the answer will be 1/-2x! :)
8 0
4 years ago
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