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3 years ago

Evaluate 3x2 - 4 when x = 2. A. 12 B. 32 c. 2 D. 8

Mathematics

2 answers:

Svetach [21]3 years ago

5 0

$\text{Plug in and solve:}\\\\3(2)^2-4\\\\3(4)-4\\\\12-4\\\\8\\\\\boxed{\text{D). 8}}$

Bumek [7]3 years ago

3 0

Answer:

Step-by-step explanation:

3x^2 - 4

Let x = 2

3 * 2^2 -4

Exponents first

3 *4 -4

Then multiply

12 -4

Now subtract

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Suppose y is a positive integer.If x-(-y)=z will z be greater than x ?

alexira [117]

Answer:

Yes, z will be greater than x.

Step-by-step explanation:

Given expression is $x- (-y)=z \ for \ y \ is \ a \ positive \ integer.$

now let y = 2 and x = 1

Then, $x- (-y)=z \\1+2 = 3 \\\\$

where $z> x$ i.e. 3 > 1

on simplifying the given expression in terms of y

$y=z-x$

now suppose if x = 7 and z=3 then,

$y = (z-x) = (3-7) = (-4)$

which gives value of y in terms of negative integer which is not possible according to the given statement since y is a positive integer. Therefore, if y is a positive integer then z will be greater than x.

3 0

3 years ago

Read 2 more answers

Find the coordinates of the intersection of the medians of △ ????BC given ????(2, 4), ????(−4, 0), and ????(3, −1).

Damm [24]

Answer:

The coordinates of the intersection of the medians of △ABC is (1/3, 1).

Step-by-step explanation:

Consider the vertices of △ABC are A(2, 4), B(−4, 0), and C(3, −1).

Intersection of the medians of a triangle is known as centroid.

Formula for centroid of a triangle is

$Centroid=(\dfrac{x_1+x_2+x_3}{3},\dfrac{y_1+y_2+y_3}{3})$

Using the above formula the centroid of △ABC is

$Centroid=(\dfrac{2-4+3}{3},\dfrac{4+0-1}{3})$

$Centroid=(\dfrac{1}{3},\dfrac{3}{3})$

$Centroid=(\dfrac{1}{3},1)$

Therefore the coordinates of the intersection of the medians of △ABC is (1/3, 1).

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2 years ago

Firing a piece of pottery in a kiln takes place at different temperatures for different amounts of time. The graph below shows t

Komok [63]

Are u gonna post the graph?

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2 years ago

H has 3 times more balls than K. they have 940 balls in all. How many more balls does H have than k?

Harman [31]

K+ 3k = 940

4k= 940

K= 940/4

K= 235

H= 3k

H= 3×>235 = 705

K= 235

H= 705

Happy to help! Please mark me as the brainliest!

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3 years ago

By visual inspection ,determine the best fitting regression model for the scatter plot

k0ka [10]

Answer:

if the scatter plot has a curve like the one attached does then it is quadratic regression.

Step-by-step explanation:

Exponential growth is a specific way that a quantity may increase over time. ... Described as a function, a quantity undergoing exponential growth is an exponential function of time, that is, the variable representing time is the exponent (in contrast to other types of growth, such as quadratic growth).

Exponential growth is a specific way that a quantity may increase over time. It occurs when the instantaneous rate of change (that is, the derivative) of a quantity with respect to time is proportional to the quantity itself.

This means if it has a curve that doesn't represent same value proportions to another axis. that is different to exponential then we say it is quadratic regression.

The formal term to describe a straight line graph is linear, whether or not it goes through the origin, and the relationship between the two variables is called a linear relationship.

5 0

2 years ago