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lbvjy [14]
2 years ago
12

HELP ASAP 6TH GRADE MATH I WILL GIVE BRAINLIEST

Mathematics
1 answer:
Alisiya [41]2 years ago
3 0
It would be letter a
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Double a number and subtract nine. algebraic expression
insens350 [35]

Answer:

2y - 9

Step-by-step explanation:

number = y

2 × y - 9

2 × y can be simplified to 2y.

2y - 9

3 0
2 years ago
Assuming a 90% confidence level, the margin of error is approximately?
elena-s [515]

Answer:

  0.3

Step-by-step explanation:

The margin of error is calculated as ...

  (standard deviation)/√(sample size) × (z*-score)

where the z*-score is chosen based on the desired confidence level.

Here, you have ...

  • standard deviation = 2.7
  • √(sample size) = √225 = 15
  • z*-score for 90% confidence level = 1.645

Putting these values in the above expression for margin of error gives ...

  2.7/15·1.645 = 0.2961 ≈ 0.3

7 0
3 years ago
Consider the graph below if point p partitions ab in the ratio 1:1, what are the coordinates of p
Serjik [45]

Answer:

P(2, 3.5)

Step-by-step explanation:

If P partitions AB in the ratio 1:1, it means AP = ½ of AB, and PB = ½ of AB.

Therefore, P can be said to be a midpoint between A and B.

To find the coordinates of P, use the midpoint formula:

Midpoint (P) of AB, for A(3, 5) and B(1, 2) is given as:

M(\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2})

Let A(3, 5) = (x_1, y_1)

B(1, 2) = (x_2, y_2)

Plug the values into the formula:

P(\frac{3 + 1}{2}, \frac{5 + 2}{2})

P(\frac{4}{2}, \frac{7}{2})

P(2, 3.5)

8 0
3 years ago
Dy/dx = y/x^2
Lady_Fox [76]
Dy/dx = y/(x^2)
dy/y = dx/(x^2)
int[dy/y] = int[dx/(x^2)] ... apply integral to both sides
ln(|y|) = (-1/x) + C
|y| = e^{(-1/x) + C}
|y| = e^C*e^(-1/x)
|y| = C*e^(-1/x)
y = C*e^(-1/x)

So you have the correct answer. Nice job.

------------------------------------------------

Check:
y = C*e^(-1/x)
dy/dx = d/dx[C*e^(-1/x)]
dy/dx = d/dx[-1/x]*C*e^(-1/x)
dy/dx = (1/(x^2))*C*e^(-1/x)
is the expression for the left hand side (LHS)

y/(x^2) = [C*e^(-1/x)]/(x^2)
y/(x^2) = (1/(x^2))*C*e^(-1/x)
is the expression for the right hand side (RHS)

Since LHS = RHS, this confirms the solution for dy/dx = y/(x^2)
8 0
3 years ago
Parker ran on a treadmill at a constant speed 6 (mph) for 27:39. How many miles did Parker run.
myrzilka [38]

Answer:

The answer is 2.765 miles.

5 0
2 years ago
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