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
muminat
2 years ago
9

The length of a rectangle is 4 times its width. The perimeter of the rectangle is 50 cm long. What is the area of the rectangle?

Mathematics
1 answer:
Eduardwww [97]2 years ago
3 0
The answer would be 100
You might be interested in
The value of the digit in the hundreds place is _ time as great as the digit in the tenths I need to find out the blank
stira [4]

it is 10 times greater


3 0
3 years ago
Read 2 more answers
What is the volume of a rectangular prism with length 7 in., height 3 in., and width 8 in.?
beks73 [17]

Answer:168

Step-by-step explanation: v=lwh

V=7x8x3

= 168

3 0
3 years ago
3y <= -2x+18
weeeeeb [17]

Answer:

  • A (-4, -3)
  • C (2, 4)
  • E (3, 2)

Step-by-step explanation:

It is convenient to use technology to plot the points and the functions to see what lies where. The first attachment shows such a plot.

_____

Of course, you can do the function evaluations. For example, testing answer B, we find ...

... 3·6 ≤ -2·1 +18 . . . . <em>false</em> for the first equation — not a solution

Checking all the points requires 10 function evaluations. When things get repetitive like that, I like to use a graphing calculator or spreadsheet.

_____

<em>Using a calculator</em>

The second attachment shows a calculator evaluating the viability of each point as a solution. The equations have been rearranged to ...

  • -2x -3y +18 ≥ 0
  • -x +4y +12 ≥ 0

This makes it easy to look at the evaluation results to see if the solution is viable or not.

The x-values of the points are entered into list L₁ and the y-values into L₂. The result of the first inequality above is in L₃ and the result for the second inequality is in L₄. Any negative value in L₃ or L₄ shows a point that is <u>not</u> part of the solution set. Points B and D fail to match problem requirements.

Points A, C, and E are in the solution set.

6 0
3 years ago
Can someone answer this please!!
Katyanochek1 [597]

Answer:

<u>The perimeter of the square is option E. 16√5 mm.</u>

<u>The area of the square is option A. 80 mm².</u>

Step-by-step explanation:

1. Let's calculate the perimeter of this square:

The perimeter of a square is the sum of its side 4 times, thus:

Perimeter = 4√5 + 4√5 + 4√5 + 4√5

<u>Perimeter = 16 √5</u>

<u>Perimeter = 4 * 4√5 = 16√5</u>

<u>The correct answer is option E. 16√5 mm</u>

2. Let's calculate the area of this square:

The area of a square is the length of its side squared, thus:

Area = (4√5)²

Area = 4√5 * 4√5

Area = (4 * 4 * √5 * √5)

Area = 16 * 5 = 80

<u>The correct answer is A. 80 mm²</u>

5 0
3 years ago
Solve the equation for x∈Z <br><br>-x² +8x -14 ≥ 0
kenny6666 [7]
ax^2+bx+c=0\\\Delta=b^2-4ac\\if\ \Delta < 0\ then\ no\ solutions\\if\ \Delta=0\ then\ one\ solution:x=\frac{-b}{2a}\\if\ \Delta > 0\ then\ two\ solutions:x=\frac{-b\pm\sqrt\Delta}{2a}\\================================\\\\-x^2+8x-14\geq0\ \ \ \ |multiply\ both\ sides\ by\ (-1)\ \{change\ \geq\ on\ \leq\}\\\\x^2-8x+14\leq0\\\\a=1;\ b=-8;\ c=14\\\\\Delta=(-8)^2-4\cdot1\cdot14=64-56=8 > 0\\\sqrt\Delta=\sqrt8=\sqrt{4\cdot2}=\sqrt4\cdot\sqrt2=2\sqrt2

x_1=\frac{-(-8)-2\sqrt2}{2\cdot1}=\frac{8-2\sqrt2}{2}=\frac{8}{2}-\frac{2\sqrt2}{2}=\boxed{4-\sqrt2}\\\\x_2=\frac{-(-8)+2\sqrt2}{2\cdot1}=\frac{8+2\sqrt2}{2}=\frac{8}{2}+\frac{2\sqrt2}{2}=\boxed{4+\sqrt2}\\\\============================

ax^2+bx+c=0\\\\if\ a > 0\ then\ the\ parabola\ o pen\ up\\if\ a < 0\ then\ the\ parabola\ o pen\ down\\========================\\\\a=1 > 0-therefore\ o pen\ up\ (look\ at\ the\ picture)\\\\===============================\\\\Answer:x\in\left


Solutions\ in\ \mathbb{Z}:\\\\\sqrt2\approx1.4\\\\threfore:4-\sqrt2\approx4-1.4=2.6\ and\ 4+\sqrt2\approx4+1.4=5.4\\\\look\ at\ the\ second\ picture:x=3\ or\ x=4\ or\ x=5\ (x\in\{3;\ 4;\ 5\})

6 0
3 years ago
Read 2 more answers
Other questions:
  • Please help. I don't know how to answer this.
    12·1 answer
  • I don’t understand the symbols in number 5 please
    14·1 answer
  • Find the values of x and y.
    14·1 answer
  • Graph the equations to solve the system y= 1/2x + 6 y = -1/2x + 4
    7·1 answer
  • 2 friends share 1/4 gallon of lemonade equally. what fraction of the lemonade does each friend get?
    15·2 answers
  • Round the fraction to the nearest whole or half 8/14
    11·1 answer
  • What’s the answer to this
    6·1 answer
  • Give an example of two other body systems that work together, and explain how they support each other
    5·2 answers
  • What is the solution set for this inequality?
    12·2 answers
  • 3x + 8y = 7<br><br> 2x - 2y = -10<br> what is x and y show work please<br> basically show work
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!