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Mathematics

2 answers:

atroni [7]3 years ago

8 0

Answer:

x=3√5

Step-by-step explanation:

This is a right angle triangle

So the equation is

2²+x²=7²

x=√7²-2²

x=3√5

Ray Of Light [21]3 years ago

7 0

Answer:

x=3√5

Step-by-step explanation:

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(2a+b) (a-b) + (2a-b) (a+b)

yanalaym [24]

Answer: 4a^2-2b^2 (I think this is right)

Step-by-step explanation:

Using the order of operations I started by multiplying both of the sides separately. The left side of the equation becomes 2a^2-b^2-ab while the right becomes 2a^2-b^2+ab. Then I put the sides together to add them and after combining like terms it becomes 4a^2-2b^2.

8 0

2 years ago

What are all the factors of 27

kicyunya [14]

The factors of 27 is as follows:
1,3,9, and 27
or
1×27
and
3×9

7 0

4 years ago

Consider the following regression output where the dependent variable is testscores and the two explanatory variables are the st

jeyben [28]

Answer:

The correct option is (A).

Step-by-step explanation:

The multiple linear regression equation is given by, $y=\alpha +\beta _{1} x_{1}+\beta _{2}x_{2}$ , where α = constant and β $_{i}$ = slope coefficients of regression line.

To test if there is a important relationship amid X $_{i}$ and Y, we use the t-statistic test.

The t-statistic for regression coefficient analysis is given by,

$t=\frac{\beta_{i}}{S.E._{\beta_{i}}}$

The regression equation for test scores dependent upon the two explanatory variables, the student-teacher ratio and the percent of English learners is:

$\text{TestScore} = 698.9 - 1.10 \text{ STR} - 0.650 \text{ PctEL}$