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3 years ago

Given h(x) = 3x^2 - 2x +8 what is h(2) Help please

Mathematics

1 answer:

Georgia [21]3 years ago

4 0

Answer:

h(2)=16

Step-by-step explanation:

1.) add 2 as a substitute for x

$3(2)^{2} -2(2)+8$

2.) solve the equation with the method of the PEMDAS (Parenthesis, exponents, multiplication, division, addition, and subtraction) and FLTR (From left to right (implied to do multiplication or division from left to right and then do subtraction to addition from left to right)

so you must do $2^{2}$ first then multiply that with 3

3.)and then multiply $-2 with 2$

4.) add everything from left to right and you should get 16 :)

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A rectangular swimming pool is twice as long as it is wide. A small concrete sidewalk surrounds the pool and is a constant 2 fee

Naddika [18.5K]

Answer:

The dimensions of the pool are:

Width: 8.944 feet

Length: 17.888 feet

Step-by-step explanation:

From Geometry, the area of a rectangle ( $A$ ), measured in square feet, is determined by the following equations:

$A = w\cdot l$ (1)

Where:

$w$ - Width, measured in feet.

$l$ - Length, measured in feet.

If we know that $w = x$ , $l = 2\cdot x$ and $A = 160\,ft^{2}$ , then we get the following second order polynomial:

$2\cdot x^{2}-160 = 0$ (1)

And we solve the expression for $x$ :

$2\cdot x^{2} = 160$

$x^{2} = 80$

$x = \sqrt{80}\,ft$

$x \approx 8.944\,ft$

Then, the dimensions of the pool are, respectively:

$w \approx 8.944\,ft$ and $l \approx 17.888\,ft$

5 0

3 years ago

Determine if the following relation is a function or not

Darya [45]

1 is not. 2 is. 3 is not. 4 is. 5 is. 6 is. 7 is not. 8 is.

7 0

3 years ago

Nola purchased 2.5 pounds of cheese for 10. $50 her mother purchased 3 pounds of the same cheese for $12.60 the cost of the chee

Delvig [45]

The answer is 5.2 because if you do 12.60 - 10 it’s 2.6 so you add another 2.6 because it’s 2.6 for a half a pound so if you add the two half of pounds it will add up to one pound so it will be 2.6 + 2.6= 5.2 so basically 5.20$

6 0

3 years ago

What is 9/10-6/10 or can you not do it?

Olin [163]

Answer:

3/10

Step-by-step explanation:

9-6=3

both fractions have the same denominator so they keep it

9/10 - 6/10 = 3/10

5 0

3 years ago

A store is instructed by corporate headquarters to put a markup of 25% on all items. An item costing $16 is displayed by the s

tigry1 [53]

Answer:

$20

Step-by-step explanation:

the manager's error could likely be putting the percentage mark up rather than the markup price added to the original price

25%×16

= $4

mark up price= (16+4)$

= $20

7 0

3 years ago