All categories

3 years ago

Please help!! I do not understand this!

Mathematics

1 answer:

jarptica [38.1K]3 years ago

8 0

Answer: C

Step-by-step explanation:

Replace x with $-\frac{2}{3}$ and solve.

f(x) = 3x² - 6x - 1

f( $-\frac{2}{3}$ ) = 3( $-\frac{2}{3}$ )² - 6( $-\frac{2}{3}$ ) - 1

= 3( $\frac{4}{9}$ ) + 4 - 1

= $\frac{4}{3}$ + 3

= $\frac{4}{3}$ + $\frac{9}{3}$

= $\frac{13}{3}$

You might be interested in

Find the value of x in the triangle shown below. Choose 1 answer:

Ad libitum [116K]

For the triangle, x is 12 units long.

Step-by-step explanation:

Step 1:

According to the Pythagorean theorem, the square of the hypotenuse is equal to the sum of the squares of the other two sides.

The hypotenuse is the side which is the longest in the triangle and is always opposite the right angle.

In the given triangle, the hypotenuse is 13 units long. The other two sides measure 5 units and x units.

Step 2:

By substituting the known values, we get

$13^{2} = 5^{2} + x^{2} .$

$x^{2} = 169 - 25 = 144.$

$x = 12.$

Rounding this off to the nearest hundred, we get that x is 12 units long.

7 0

3 years ago

a meal at a restaurant cost $49.28. If the customers leave $8.23 for to determine the tip rate to the nearest whole percent. Wha

Monica [59]

Now, if the customers left 8.23 extra, based on a percentage of the cost of the meal, namely, the 8.23 is a percent of 49.28, then

if we take 49.28 to be the 100%, how much of a percentage is 8.23?

$\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
49.28&100\\
8.23&t
\end{array}\implies \cfrac{49.28}{8.23}=\cfrac{100}{t}\implies t=\cfrac{8.23\cdot 100}{49.28}$

8 0

3 years ago

Callie surveyed 40 students at her school to see how many have dogs and/or cats. She found that 40% of students who have dogs, d

irina [24]

I think you need to show the tablle

6 0

3 years ago

Need math help As soon as possible

ehidna [41]

i believe the answer is B

but i could always be wrong :(

8 0

3 years ago

Read 2 more answers

A set of data points has a line of best fit of y = –0.2x + 1.9. What is the residual for the point (5, 1)?

alisha [4.7K]

A. 0.1
The residual is the difference between the observed value and the predicted value for a data point. You obtain it by subtracting the predicted value from the observed value. So the predicted value is: y = -0.2x + 1.9 y = -0.2*5 + 1.9 y = -1 + 1.9 y = 0.9 Therefore the residual is: r = 1 - 0.9 r = 0.1 And the value of 0.1 matches option "A".

3 0

3 years ago