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Elena-2011 [213]

2 years ago

7

I need help! who ever get this right and explain nicely then I make you brainlist.

1 answer:

Lelechka [254]2 years ago

5 0

Answer:

1. 64

2. 72 square feet

3. 31.5 square feet

Step-by-step explanation:

For the first one use the equation A=bh.

Plug in your values: A=12.8*5.

Solve: A=64

For the second one multiply 8*3 which gives you 24. Next multiply that by 3 to give you 72 square feet.

For the third one multiply 9 by 3.5 to get 31.5 square feet.

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Which of the following is the definition of a rational number? a number that can be written as a nonterminating or nonrepeating

Mazyrski [523]

The answer is <span>a number that can be written as a ratio of two integers.

I hope this helps!</span>

7 0

3 years ago

How do I solve -2(x+5)=4

Charra [1.4K]

Answer:

-7

Step-by-step explanation:

-2(x+5)=4

open the bracket with -2

-2x - 10 = 4

combine the like terms

-2x = 4 + 10

-2x = 14

divide by -2

-2x/-2 = 14/-2

x = -7

8 0

3 years ago

Read 2 more answers

Given the set points K+1:(-1,8),(1,0) and (2,5), find the quadratic polynomial interpolate

Sauron [17]

Answer:

The interpolating polynomial is $p(x) = 1-4x+3x^2$ .

Step-by-step explanation:

We want to find a quadratic polynomial $p(x)$ such that $p(-1)=8$ , $p(1)=0$ and $p(2)=5$ . In order to do this let us write $p(x) = a_0+a_1x+a_3x^2$ .

Now, evaluating the polynomial in the points -1, 1 and 2 we get

$\begin{cases} 8 = p(-1) &= a_0-a_1+a_2\\ 0 = p(1) &= a_0+a_1+a_2\\ 5 = p(2) &= a_0+2a_1+4a_2\end{cases}$

This relations give us a linear system of equations:

$\begin{cases} 8 &= a_0-a_1+a_2\\ 0 &= a_0+a_1+a_2\\ 5&= a_0+2a_1+4a_2\end{cases}$

where the $a_0$ , $a_1$ and $a_2$ are the unknowns.

The augmented matrix of the system is

$\begin{pmatrix}1 & -1 & 1 & 8\\ 1 & 1 & 1 & 0\\ 1 & 2 & 4 & 5\end{pmatrix}$

In this matrix it is easy to eliminate the 1's of the first column and get

$\begin{pmatrix} 1 & -1 & 1 & 8\\ 0 & 2 & 0 & -8\\ 0 & 3 & 3 & -3\end{pmatrix}$

From this matrix we can find the values of each unknown. Notice that the second row gives us $2a_2=-8$ that yields $a_1=-4$ .

Then, the third row means $3a_1+3a_2=-3$ that gives $-12+3a_2=-3$ . So, $a_2=3$ .

Finally, the first row is $a_0-a_1+a_2=8$ and substituting is $a_0+7=8$ that yields $a_0=1$ .

Therefore, the interpolating polynomial is

$p(x) = 1-4x+3x^2$ .

8 0

3 years ago

Solve x2 – 10x + 25 = 35 for x

ira [324]

Answer:

x = 5 ± √35

Step-by-step explanation:

Rewrite the left side as a square, then take the square root. Finally, add 5.

(x -5)² = 35

x -5 = ±√35

x = 5 ±√35

4 0

2 years ago

The dimensions of a box are (x + 2), (2x - 1) and (3x + 1). What is the volume of the box?

brilliants [131]

The correct answer is (2).

5 0

3 years ago