1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Elena-2011 [213]
2 years ago
7

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

Mathematics
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.

You might be interested in
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
Other questions:
  • Rowan has 3 pieces of yarn as described below
    9·2 answers
  • Which number completes this number sentence? [ ? ] &gt; -6<br> A.-8<br> B.-7<br> C.-6<br> D.0
    11·1 answer
  • 87 markes out of 100 as a percentage
    15·1 answer
  • Which equation, in point-slope form, represents a line with m= -4/7 that goes through the point (-1, 4)?
    6·1 answer
  • The length of a piece of lumber is 6.5 meters. How many centimeters is this?
    12·2 answers
  • Check for understanding. <br><br> need help with all 3. PLS HELP
    11·1 answer
  • There are 48 students going on a field trip and 1/4 are girls how many boys are going on the field trip? In tape diagram
    12·1 answer
  • X + y = 21<br> 3x – 2y = -12
    10·2 answers
  • Which of the following sets of ordered pairs is a function?
    14·1 answer
  • A roll of ribbon was 12 meters long. Diego cut 9 pieces of ribbon that were 0.4 meters each to tie some presents. He then used t
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!