All categories

2 years ago

Whats the answer can someone answer please

Mathematics

1 answer:

Ipatiy [6.2K]2 years ago

7 0

Answer:

8. b

9. d

Step-by-step explanation:

You might be interested in

Which two numbers on the number line has an absolute value of 3?

luda_lava [24]

Solution

To find Which two numbers on the number line has an

absolute value of 3

Absolute value means " how far a number is from

zero " .

"3" is 3 away from zero .

and " -3 " is also 3 away from zero .

i.e

| 0 - 3 | = 3

| 3 - 0 | = 3

So , the absolute value of "3 " is 3

similarly , absolute value of "3 " is 3 .

Hence , the two numbers are -3 and 3

6 0

3 years ago

You were given the polynomial f(x)=3x^3+13x^2+19x+k and you know that f(-2)=0find k

eduard

Answer:

k = 10

Explanation:

The initial polynomial is:

$f(x)=3x^3+13x^2+19x+k$

If f(-2) = 0, then when we replace x by -2, the result will be 0. It means that we can write the following equation:

$\begin{gathered} f(-2)=3(-2)^3+13(-2)^2+19(-2)+k=0 \\ 3(-2)^3+13(-2)^2+19(-2)+k=0 \end{gathered}$

Therefore, we can solve for k as follows:

$\begin{gathered} 3(-8)+13(4)+19(-2)+k=0 \\ -24+52-38+k=0 \\ -10+k=0 \\ -10+k+10=0+10 \\ k=10 \end{gathered}$

So, the value of k is 10

6 0

1 year ago

Find the least squares regression equation using the school year (in number of years after 2000) for the input variable and the

Ad libitum [116K]

Answer-

The least squares regression equation using the school year (in number of years after 2000) for the input variable and the average cost (in thousands of dollars) for the output variable is "y=0.937x+12.765" .

Solution-

The independent variable / input variable= x = Number of years after 2000 ( = year-2000)

The dependent variable / output variable = y = Average cost in thousands of dollars

(The table has been attached herewith.)

To find the regression equation for a group of (x,y) points,

We have to calculate the slope and y-intercept, then we can put those values in the equation y = mx + c ( Slope - Intercept formula)

We know that,

$Slope=m=\frac{N\sum xy -\sum x\sum y}{N\sum x^{2}- (\sum x)^{2}}$

Putting the values from the table,

$m=\frac{(8 \times 1020.206)-(52 \times 150.894)}{(8 \times 3810)-(52^2)}$

( ∵ Instead of 150,894 we have to put 150.894 as we have find the line for year and thousands of dollars )

$\Rightarrow m =\frac{8161.648-7846.488}{3040-2704} =\frac{315.16}{336}=0.937$

Now, for the y-intercept,

$c =\frac{\sum y -m(\sum x)}{N}$

Putting the values,

$c=\frac{150.894-(52 \times 0.937)}{8}=\frac{102.125}{8}=12.765$

Now, putting the values of c and m, in the Slope-Intercept formula,

$y=0.937x+12.765$

3 0

3 years ago

9 + 15m factorisation of algebraic expression that contain common factor

Svet_ta [14]

The common factor would be 3 because 3 is the highest multiple of 15 and 9

6 0

3 years ago

Read 2 more answers

Luke's Motel rents rooms with 2 beds for $65 and rooms with 1 bed for $56. On a given night Luke's Motel takes in $4836, and twi

Marat540 [252]

52 double bed rooms were rented, and that means there were 26 single bed rooms rented.

7 0

3 years ago

Whats the answer can someone answer please​

Whats the answer can someone answer please