A student solved a system of equations by elimination. Describe and correct the error made in the part of the solution shown.

Answer:

3

Step-by-step explanation:

its 3

Answer:

Step-by-step explanation:

Answer:

B, x=5

Step-by-step explanation:

Both triangles are similar with a ratio of 22.5/9

so using that an equation can be created like this, [tex]\frac{22.9}{9}[/tex] = [tex]\frac{23.5}{x+4.4}[/tex]

If simplified, 22.9(x + 4.44) = 23.5(9)

22.5x + 99 = 211.5

22.5x = 112.5

x = 5

Answer: 7.8 commission

Step-by-step explanation:

78/10=7.8

Answer:

(0, -4)

Step-by-step explanation:

Given the inequality expression

y>−2x+y≤4

This can be splitted into

y>−2x+y .... 1

and -2x+y≤4 .... 2

From1;

y>−2x+y

y - y >−2x

0 >−2x

-2x < 0

x > 0/-2

x>0

Substitute x = 0 into 2

-2(0)+ y ≤4

y≤4

Hence the solution is (0, -4)

Answer:

The answer would be (1,3)

Step-by-step explanation:

Answer:

x = 1

Step-by-step explanation:

3(x − 2) + 5 = 2(5x − 4)

Distributive property

3 * x - 3 * 2 + 5 = 2 * 5x - 2 * 4

3x - 6 + 5 = 10x - 8

Combine like terms

3x - 1 = 10x - 8

Add 8 on both sides

3x - 1 + 8 = 10x - 8 + 8

3x + 7 = 10x

Subtract 3x on both sides

3x - 3x + 7 = 10x - 3x

7 = 7x

Divide by 7 on both sides to isolate the variable

7/7 = 7x/7

1 = x

Check

3(x − 2) + 5 = 2(5x − 4)

Replace the "x" with 1

3 ( 1 - 2 ) + 5 = 2 ( 5 * 1 - 4)

3 * -1 + 5 = 2 * 1

2 = 2

Correct

Hope this helped!

Have a supercalifragilisticexpialidocious day!

Step-by-step explanation:

3(x - 2) + 5 = 2(5x - 4)

3x - 2 + 5 = 10x - 8

3x + 3 = 10x - 8

3x = 10x - 8 - 3

3x = 10x - 11

3x + 11 = 10x

11 = 10x - 3x

11 = 7x

11/7 = x

therefore, x = 1 4/ 7 ( mixed fraction form)

Answer:

d. 17.5 and 28 units

Step-by-step explanation:

An area of a rectangle is length times width. 8x times 5x = 40x^2. 40x^2 is eqaul to 500. After dividing by 40 and taking the square root of the quotient, x is approximately 3.54. 5 times 3.54 and 8 times 3.54 will yield approximately 17.5 and 28 units.

Answer:

(x -10)(x-1)

Step-by-step explanation:

Consider the form x^2 + bx + c. Find the pair of integers whose product is c and whose sum is b in this case whose product is 10 and whose sum is -11.

Answer:

0.33

Step-by-step explanation:

Answer:

i would say none of the above can i get brainlest

Step-by-step explanation:

Answer:

110 apples an hour divide 440 by 4 and 220 by 2

Step-by-step explanation:

Answer:

110 apples per hour

Step-by-step explanation:

hope it helps!

Answer:

7.33

Step-by-step explanation:

Answer:

3:2

Step-by-step explanation:

Answer:

B.

Step-by-step explanation:

Answer: A. 95

Step-by-step explanation: The angles in a triangle are supposed to add up to 180 degrees, 55+30= 85 and 85+95 is 180.

Answer:

X=4

Step-by-step explanation:

Answer:

A. 8 gallons

B. Drive by car is $59.4 cheaper than travel by train

Step-by-step explanation:

According to the scenario, given data are as follows,

Total drive = 400 miles

Total drive per gallon = 50 miles

Fuel cost per gallon = $4.45

A. So, Total fuel required to drive 400 miles can be calculated as follows,

Total fuel required =  Total drive ÷ Total drive per gallon

By putting value, we get,

Total fuel required = 400 ÷ 50

= 8 gallons

B. Total cost if drive by car = 8 gallons × $4.45 = $35.6

Cost if travel by train = $95

Hence it is clearly shows that drive by car is much cheaper than travel by train.

Cost saved by travel by car = $95 - $35.6 = $59.4

So, drive by car is $59.4 cheaper than travel by train.

Answer:

Step-by-step explanation:

Y=1/3y+-5/3

Answer 29.95 your welcome.

Step-by-step explanation:

Ok so you will just need to subtract 65.45-35.5 and get your answer.

Ps could have used a calculator.

Answer:

x = 20

Step-by-step explanation:

first, you would take all of the angles and add them up to 180

2x+40+100=180

second, we combine like terms

2x+140=180

third, we solve for x

2x+140=180

    -140  -140

2x=40

x=20

i hope this helps!

Answer:

X=20

Step-by-step explanation:

the total angle degree of a triangle is always 180 so we have two point 100 and 40 add those and you get 140 so you have 40 left but that angle says 2 X so 2x is 40 so ÷ 2 to get 1x which is 20

Don't think this is technically math

Answer:

Solve for  x  by simplifying both sides of the equation, then isolating the variable.

x  =  − 6

Step-by-step explanation:

I hope this helps! Have a nice day!

Answer:

B. 2,3,4

Step-by-step explanation:

Using the Pythagorean Theorem:

A. 1^2+3^2=(sqrt10^2)

B. 2^2+3^2not equal to 4^2

C. 3^3+4^2=5^2

D. 8^2+15^2=17^2

The set of numbers {2, 3, 4} could not represent the lengths of the sides of a right triangles.

The correct option is an option (B).

"For integers a, b, c if a² + b² = c², then these integers are called as Pythagorean triples they can be denoted as (a, b, c)"

"For a right triangle,

c² = a² + b², where c is the hypotenuse and a, b are any two sides of the right triangle."

"It is the lonest side of the right triangle."

For given example,

We need to find the set of numbers that could not represent the lengths of the sides of a right triangles.

If the set of numbers is not Pythagorean triple then it would not represent the lengths of the sides of a right triangles.

A) {1, 3, √10}

let a = 1, b = 3, c = √10

⇒ c² = (√10)²

⇒ c² = 10

Consider, a² + b² = 1² + 3²

⇒ a² + b² = 1 + 9

⇒ a² + b² = 10

⇒ a² + b² = c²

This means, these numbers are Pythagorean triple.

So, these numbers represents the lengths of the sides of the right triangle with hypotenuse √10 unit and other two sides are 1 unit and 3 units.

B) {2 ,3, 4}

let a = 2, b = 3, c = 4

⇒ c² = (4)²

⇒ c² = 16

Consider, a² + b² = 2² + 3²

⇒ a² + b² = 4 + 9

⇒ a² + b² = 13

⇒ a² + b² ≠ c²

This means, these numbers are not a Pythagorean triple.

So, these numbers does not represent the lengths of the sides of the right triangle.

C) {3, 4, 5}

let a = 3, b = 4, c = 5

⇒ c² = (5)²

⇒ c² = 25

Consider, a² + b² = 3² + 4²

⇒ a² + b² = 9 + 16

⇒ a² + b² = 25

⇒ a² + b² = c²

This means, these numbers are Pythagorean triple.

Hence, these numbers represents the lengths of the sides of the right triangle with hypotenuse 5 units and other two sides are 3 units and 4 units.

D) {8, 15, 17}

let a = 8, b = 15, c = 17

⇒ c² = (17)²

⇒ c² = 289

Consider, a² + b² = 8² + 15²

⇒ a² + b² = 64 + 225

⇒ a² + b² = 289

⇒ a² + b² = c²

This means, these numbers are Pythagorean triple.

So, these numbers represents the lengths of the sides of the right triangle with hypotenuse 17 units and other two sides are 8 units and 15 units.

Therefore, the set of numbers {2, 3, 4} could not represent the lengths of the sides of a right triangles.

The correct option is an option (B).

Learn more about Pythagorean triple here:

https://brainly.com/question/15190643

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Answer:

D

Step-by-step explanation:

1 gallon can run a car up to 60 miles so i would guess 1000

Answer:

5/2

Step-by-step explanation:

i hope this is the answer