Answer:
A
Step-by-step explanation:
If you substitute the values given in the question, i.e. (-10,3), the only equation that satisfies this solution is A.
Try substituting
x for (-10)
y for (3)
Answer:
12
Step-by-step explanation:
21=31
31=7+2-3+0=12
This is correct because linear equations mean add subtract divide and multiply instead of finding roots and squares
Answer:
infinitely many solutions
Step-by-step explanation:
Given the 2 equations
2x + 2y = 18 → (1)
x + y = 9 → (2)
Equation (1) is twice (2)
Thus the equations are equal and will have infinite solutions
Answer:
A. 6.5
Step-by-step explanation:
First we find the average
of the 9 data:

Where n is the data number, that in this case is 9.

The formula of the standard deviation
is:

We replace the data and find the value of the standard deviation:


We approximate the number and the solution is 6,5
Answer:
The answer to your question is letter D
Step-by-step explanation:
Letter A. It is not possible because it is necessary to considers the variable (number of weeks)and this option does not consider it.
Letter B. It is not possible besides it consider the number of weeks the results do not correspond with the conditions given.
Example: for week 1, the number of freckles is 10 + 2¹ = 10 + 2 = 12, and the number of freckles must be 20.
Letter C. It is incorrect because the numbers of freckles do not correspond with the conditions.
Example: week 2 f = 2(10) ² = 2(100) = 200, it is higher than the expected.
Letter D. This is the correct answer because it satisfied the conditions given.