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mash [69]
3 years ago
15

4. Explain and correct the error made by a student who simplified this expression.

Mathematics
1 answer:
Fiesta28 [93]3 years ago
3 0

Answer:

I notice that the first equation has a 7x, term and the second equation has a -7x term. These terms will cancel if we add the equations together—that is, we'll eliminate the the x terms:

Step-by-step explanation:

2y+7x= -5 + 5y-7x=12

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Find the distance between the points (3, 8) and (0,4).
Bingel [31]

Answer:

5

Step-by-step explanation:

(3,8) (0,4)

X1 = 3    X2 = 0

Y1 = 8    Y2 = 4

D=\sqrt{(X1-X2)^{2}+ (Y1-Y2)^{2}  }

D= \sqrt{(3-0)^{2} + (8-4)^{2} }

Do what's in the parentheses so...

  1. 3-0= 3
  2. 8-4= 4

Now plug it in!

D= \sqrt{(3)^{2}+(4)^{2}  }

Now you are going to finish the parentheses so...

  1. (3)^2= 9
  2. (4)^2= 16

Plug that in so that you have this...

\sqrt{9+16}

Add 9+16 to get...

\sqrt{25}

Then you are going to find the number or numbers that make this a perfect square...

\sqrt{25}= 5

So 5 is your answer

7 0
3 years ago
The sum of 19 data values is 2,375. What is the average of the data values?
DIA [1.3K]

Answer:

125

Step-by-step explanation:

2375/19

5 0
3 years ago
Armando took his dog, Tasha, to the vet. Tasha was placed on the scale and weighed 45.72 pounds. The veterinarian told Armando t
belka [17]

Answer: 17 pounds

Step-by-step explanation:

6 0
3 years ago
Help please number 7
chubhunter [2.5K]
The answer is D
Hope this helps

6 0
3 years ago
What is the area of this figure?
Gelneren [198K]

Area of the figure is 102 cm²

Step-by-step explanation:

  • Step 1: Find the area of the square with side = 6 cm.

Area of the square = (side)² = 6² = 36 cm²

  • Step 2: Find the area of the trapezoid.

Length of parallel side 1 = 7 cm

Length of parallel side 2 = 21 - 6 = 15 cm

Height = 6 cm

⇒ Area of the trapezoid = 1/2 × (Sum of parallel sides) × height

                                        = 1/2 × (7 + 15) × 6

                                        = 1/2 × 22 × 6 = 66 cm²

  • Step 3: Find the area of the figure.

Area of the figure = Area of the square + Area of the trapezoid

                             = 36 + 66 = 102 cm²

6 0
2 years ago
Read 2 more answers
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