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alina1380 [7]
3 years ago
7

A student answered this story problem. Use estimation to check the student's answer. Lizzie has $49. Her older sister has $184.

How much money do they have altogether? Student's answer: They have a total of $233. Which estimate is correct and was the student's answer reasonable?
Mathematics
1 answer:
Anna35 [415]3 years ago
6 0

Answer:No the student was not right.Neither of the estimations were right because she did not estimate at al.

Step-by-step explanation:

1.Round 49 to the nearest ten: 50.

2.Round 184 to the nearest ten:180.

3.Add 50+180 to get 230.

The student was not right because she did not estimate 49 nor 184.

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-x -7y = 14<br> -4x -14y =28
koban [17]

Given:

\to \bold{-x -7y = 14}\\\\\to \bold{-4x -14y =28}\\\\

To find:

\bold{x \ and \ y}=?

Solution:

\to \bold{-x -7y = 14}..................... (i) \\\\\to \bold{-4x -14y =28} .................(ii)\\\\

Solving the equation (i):

\to \bold{-x -7y = 14} \\\\  \to \bold{-x=  14+7y} \\\\    \to \bold{x= - (14+7y)} \\\\

Putting the value of x into the equation (ii):

\to \bold{-4(-(14+7y)) -14y =28} \\\\\to \bold{4(14+7y) -14y =28} \\\\\to \bold{56+28y -14y =28} \\\\\to \bold{56+14y =28} \\\\\to \bold{28+14y =0} \\\\\to \bold{14y =-28} \\\\\to \bold{y =\frac{-28}{14}} \\\\\to \bold{y =-2} \\\\

Putting the value of y into the equation (i):

\to \bold{-x -7(-2) = 14}\\\\\to \bold{-x +14 = 14}\\\\\to \bold{-x  = 14-14}\\\\\to \bold{x  = 0}\\\\

So, the value of \bold{x=0 \ and\  y= -2}\\\\

Learn more:

brainly.com/question/10151402

7 0
3 years ago
Please help. Brainliest for the best explanation.
Virty [35]
Explanation of what exactly
5 0
4 years ago
Write the fraction 17/24 as a percent to the nearest hundredth.
kondaur [170]
First divide 17 by 24
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5 0
3 years ago
Read 2 more answers
Please help!!
KatRina [158]

Answer:

The length of a side of the square is 6.3 units.

Step-by-step explanation:

When given vertices for a given shape, the length of the side is calculated using the formula:

√(x2 - x1)² + (y2 - y1)²

When given vertices (x1 , y1) and (x2 , y2)

Square ABCD has vertices A(-2,-3), B(4, -1), C(2,5), and D(-4,3). Find the length of a side

Side AB : A(-2,-3), B(4, -1)

√(x2 - x1)² + (y2 - y1)²

= √(4 -(-2))² + (-1 -(-3))²

= √ 6² + 2²

= √36 + 4

= √40

= 6.3245553203

≈ 6.3 units

B(4, -1), C(2,5),

√(x2 - x1)² + (y2 - y1)²

= √ (2- 4)² + (5- (-1))²

= √-2² + 6²

= √4 + 36

= √40

= 6.3245553203

≈ 6.3 units

C(2,5), D(-4,3).

√(x2 - x1)² + (y2 - y1)²

= √(-4 - 2)² + (3 - 5)²

= √-6² + -2²

= √36 + 4

= √40

= 6.3245553203

≈ 6.3 units

A(-2,-3), D(-4,3).

√(x2 - x1)² + (y2 - y1)²

= √(-4 -(-2))² + (3 - (-3))²

= √-2² + 6²

= √4 + 36

= √40

= 6.3245553203

≈ 6.3 units

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3 years ago
Find the slope of the line. Write your answer in simplest form.
nikdorinn [45]
-1/2 because the rise over run is -3/6 and simplified its -1/2
8 0
3 years ago
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