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2 years ago

1/4x +7=10 What is X?

Mathematics

2 answers:

antiseptic1488 [7]2 years ago

6 0

Answer:

Step-by-step explanation:

first move the 7 to the right of your equation, which then becomes 10-7= 3. then divide 3 by 1/4 and x= 12

plug in 12 back into x to make sure it is correct

Alex17521 [72]2 years ago

4 0

Answer:

x=12

Step-by-step explanation:

Step 1: Subtract 7 from both sides.

Step 2: Multiply both sides by 4.

and you get x=12

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3 years ago

Read 2 more answers

Solve x^2 + 4x + 8 = 0

Mkey [24]

Answer:

x = -2 + 2 i or x = -2 - 2 i

Step-by-step explanation:

Solve for x:

x^2 + 4 x + 8 = 0

Subtract 8 from both sides:

x^2 + 4 x = -8

Add 4 to both sides:

x^2 + 4 x + 4 = -4

Write the left hand side as a square:

(x + 2)^2 = -4

Take the square root of both sides:

x + 2 = 2 i or x + 2 = -2 i

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x = -2 + 2 i or x + 2 = -2 i

Subtract 2 from both sides:

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8 0

2 years ago

In a teacher's math course, a linear regression line was calculated to predict

Marat540 [252]

The given equation is the best line that approximates the linear

relationship between the midterm score and the score in the final exam.

AJ's residual is 0.3, which is not among the given options, therefore, the correct option is. E. None of these.

Reasons:

The given linear regression line equation is; $\hat y$ = 25.5 + 0.82· $\mathbf{\hat x}$

Where;

$\hat y$ = Final exam score;

$\hat x$ = The midterm score;

AJ score in the first test, $\hat x$ = 90

AJ's actual score in the exam = 99

Required:

The value of AJ's residual

Solution:

By using the regression line equation, we have;

The predicted exam score, $\hat y$ = 25.5 + 0.82 × 90 = 99.3

The residual score = Predicted score - Actual score

∴ AJ's residual = 99.3 - 99 = 0.3

AJ's residual = 0.3

Therefore, the correct option is option E;

E. None of these

Learn more about regression line equation here:

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