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3 years ago

7.

Mathematics

2 answers:

pantera1 [17]3 years ago

4 0

(2h – 3)(3h + 4) is the same thing as

2h(3h + 4) - 3(3h + 4)

6h^2 + 8h - 9h - 12

6h^2 - h - 12

Answer B.

kirill115 [55]3 years ago

4 0

Answer:

6h^2 + 8h - 9h - 12

6h^2 - h - 12

b is the answer

Step-by-step explanation:

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Which is another way to check the sum of 104 + 34 + 228 + 877?

adell [148]

The answer is D. 877 + 228 + 34 + 104

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3 years ago

1.) Use the quadratic formula to solve the equation. If necessary, round to the nearest hundredth .x squared minus 21 x equals n

Andrew [12]

Part 1
We are given $x^2-21x=-4x$ . This can be rewritten as $x^2-18x=0$ .
Therefore, a=1, b=-18, c=0.
Using the quadratic formula
$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}=\frac{-\left(-18\right)\pm \sqrt{\left(-18\right)^2-4\left(1\right)\left(0\right)}}{2\left(1\right)}$
$x=\frac{18\pm 18}{2}$

The values of x are
$x_1=\frac{18-18}{2}=0$
$x_2=\frac{18+18}{2}=18$

Part 2
Since the values of y change drastically for every equal interval of x, the function cannot be linear. Therefore, the kind of function that best suits the given pairs is a quadratic function.

Part 3.
The first equation is $y=x^2+2$ .
The second equation is $y=3x+20$ .

We have
$x^2+2=3x+20$
$x^2-3x-18=0$
Factoring, we have
$\left(x-6\right)\left(x+3\right)=0$
Equating both factors to zero.
$x_1-6=0\rightarrow x_1=6$
$x_2+3=0\rightarrow x_2=-3$

When the value of x is 6, the value of y is
$y=3\left(6\right)+20=38$

When the value of x is -3, the value of y is
$y=3\left(-3\right)+20=11$

Therefore, the solutions are (6,38) or (-3,11)

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3 years ago

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nataly862011 [7]

Answer:

ionosphere

Step-by-step explanation:

In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere

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3 years ago

Read 2 more answers

10) Determine which of the following are functions. 11) What are the domain and range of the following relation?

Sauron [17]

Answer:

10) The first 2 on the left are functions and the one on the top right is a function, but the bottom right is not.

11) Domain = (2, 8, -1, 0) Range = (5, -2, 4, 5)

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3 years ago

If the equations 2x +y =7 and x-y=2are solved simultaneously, then y=_________

alisha [4.7K]

Answer:

y = -2x + 7 and y = x - 2

Step-by-step explanation:

2x + y = 7

y = -2x +7

x - y = 2

-y = -x +2

y = x - 2

7 0

2 years ago