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Nostrana [21]
3 years ago
8

True or false all rectangles are quadrilaterals

Mathematics
1 answer:
Leni [432]3 years ago
7 0

answer - true

all rectangles have four sides, and a shape is a quadrilateral if it has four sides

therefore, all rectangles are quadrilaterals

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Nick has 7.00. Bagels cost .75 each, and a small container if cream cheese costs 1.29. Write an inequality to find the numbers o
DENIUS [597]
.75x +1.29 = 7.00

x = the amount of bagels he wants.
6 0
3 years ago
The scarf that Anita is knitting is 12/1-4 inches long. The scarf that Jeff is knitting is 4 times as long. How long is Jeff’s s
Lisa [10]
If you meant 12 1/4 inches long then your 4 feet and 1 inch long or 49 inches.
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3 years ago
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Round 62,971 to the nearest thousand
maks197457 [2]

Answer:

60,000

Step-by-step explanation:

you get your 6 and see if the 2 is over 5 if not keep 6 and the others are 0

4 0
4 years ago
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Solve the equation using inverse operations. Check your solutions. In your final answer, include all of your work.
skad [1K]

5-2x2=-15

Two solutions were found :

                  x = ± √10 = ± 3.1623

Rearrange:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                    5-2*x^2-(-15)=0

Step by step solution :

Step  1  :

Equation at the end of step  1  :

 (5 -  2x2) -  -15  = 0

Step  2  :

Step  3  :

Pulling out like terms :

3.1     Pull out like factors :

  20 - 2x2  =   -2 • (x2 - 10)

Trying to factor as a Difference of Squares :

3.2      Factoring:  x2 - 10

Theory : A difference of two perfect squares,  A2 - B2  can be factored into  (A+B) • (A-B)

Proof :  (A+B) • (A-B) =

        A2 - AB + BA - B2 =

        A2 - AB + AB - B2 =

        A2 - B2

Note :  AB = BA is the commutative property of multiplication.

Note :  - AB + AB equals zero and is therefore eliminated from the expression.

Check : 10 is not a square !!

Ruling : Binomial can not be factored as the difference of two perfect squares.

Equation at the end of step  3  :

 -2 • (x2 - 10)  = 0

Step  4  :

Equations which are never true :

4.1      Solve :    -2   =  0

This equation has no solution.

A a non-zero constant never equals zero.

Solving a Single Variable Equation :

4.2      Solve  :    x2-10 = 0

Add  10  to both sides of the equation :

                     x2 = 10

When two things are equal, their square roots are equal. Taking the square root of the two sides of the equation we get:  

                     x  =  ± √ 10  

The equation has two real solutions  

These solutions are  x = ± √10 = ± 3.1623  

Two solutions were found :

                  x = ± √10 = ± 3.1623

6 0
3 years ago
X+2x=180 i need help on this
viktelen [127]

x+2x = 180

add like terms

3x=180

divide both sides by 3

x=60

Answer: x=60


4 0
3 years ago
Read 2 more answers
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