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3 years ago

5

Need help ASAP for exam!!!Solve for x. Just type the NUMBER with no spaces. It will be marked wrong if you don't. If you want to

write a square root, for example square root of 5

1 answer:

sattari [20]3 years ago

4 0

Answer:

Step-by-step explanation:

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Please,,, i'm begging you... help me with this and explain how you got the answer... i .. really need someones help.

GalinKa [24]

A "function" is a black box, with a funnel on top, a little door on the bottom, and a crank on the side. The way it works is:

-- You take a number, and call it 'x'.

-- You drop it into the funnel on top of the box, and you turn the crank.

-- Some gears, shafts, math operations and stuff inside the box do things to 'x', and eventually the little door on the bottom opens up and another number falls out.

-- Before you even touch that one, you call it 'y', and then you pick it up and look at it.

The number that falls out is related somehow to 'x'. It depends on 'x', AND on exactly what's inside the box ... how the gears and shafts and math operations are all hooked together. All the guts and parts inside DETERMINE what the box will do to 'x', and how 'x' will get changed, and what will come out the bottom.

We call 'y' the FUNCTION of 'x'.

If you know exactly what's inside the box, then even before you drop 'x' into the funnel, you can always tell in advance WHAT will come out.

If you DON'T know what's inside, then the only way you can describe the function is to take a bunch of numbers, drop them into the function one at a time, LOOK and SEE what comes out each time, and write it all down.

THAT's what this question is giving you.

What comes out is called the VALUE of the function for each 'x' that you drop in. The table is giving you the VALUE of 'y' (the function) for seven different 'x's. Then the question just wants you to look and see what falls out of the box when 'x' is -1 .

Look at the table. It says that when 'x' is -1, 'y' is going to be <em>3 </em>. That's the answer to the question.

We still don't know anything about what's inside the box. We don't know the structure of the FUNCTION, and exactly what it does to 'x' to produce 'y'. But we do know what'll fall out if we drop a -1 into the funnel ... because the table tells us !

Now, please get up off your knees. It's unbecoming.

7 0

3 years ago

Read 2 more answers

Two trials are conducted for an experiment. In Trial A, the measured value is 240, while the actual value is 200. In Trial B, th

Zepler [3.9K]

Answer:

A is the answer 456% and 512%

Step-by-step explanation:

Percent Errors

Trial A

Trial B

Measured Value

240

195

Actual Value

200

240

Percent Error

?

?

Complete the table.

Percent Errors

Trial A

Trial B

Measured Value

240

195

Actual Value

200

240

Percent Error

440440%

435435%

5 0

2 years ago

Could someone help me for this?

lina2011 [118]

Answer:

x = - $\frac{5}{3}$ , x = $\frac{5}{2}$

Step-by-step explanation:

to find the points of intersection equate the 2 equations , that is

7x - 15 = 10 + 12x - 6x² ( subtract 10 + 12x - 6x² from both sides )

6x² - 5x - 25 = 0 ← factor the quadratic on left side

consider the factors of the product of the coefficient of the x² term and the constant term which sum to give the coefficient of the x- term

product = 6 × - 25 = - 150 and sum = - 5

the factors are - 15 and + 10

use these factors to split the x- term

6x² - 15x + 10x - 25 = 0 ( factor the first/second and third/fourth terms )

3x(2x - 5) + 5(2x - 5) = 0 ← factor out (2x - 5) from each term

(2x - 5)(3x + 5) = 0

equate each factor to zero and solve for x

3x + 5 = 0 ⇒ 3x = - 5 ⇒ x = - $\frac{5}{3}$

2x - 5 = 0 ⇒ 2x = 5 ⇒ x = $\frac{5}{2}$

3 0

2 years ago

Solve and check the linear equation.<br> 3(x-2) + 8 = 2(x + 5)

ANEK [815]

Answer:

x = 8

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Multiplication Property of Equality
Division Property of Equality
Addition Property of Equality
Subtraction Property of Equality

<u>Algebra I</u>

Terms/Coefficients

Step-by-step explanation:

<u>Step 1: Define</u>

3(x - 2) + 8 = 2(x + 5)

<u>Step 2: Solve for </u><em><u>x</u></em>

(Parenthesis) Distribute: 3x - 6 + 8 = 2x + 10
Combine like terms: 3x + 2 = 2x + 10
{Subtraction Property of Equality] Subtract 2x on both sides: x + 2 = 10
[Subtraction Property of Equality] Subtract 2 on both sides: x = 8

<u>Step 3: Check</u>

<em>Plug in x into the original equation to verify it's a solution.</em>

Substitute in <em>x</em>: 3(8 - 2) + 8 = 2(8 + 5)
(Parenthesis) Subtract/Add: 3(6) + 8 = 2(13)
Multiply: 18 + 8 = 26
Add: 26 = 26

Here we see that 26 does indeed equal 26.

∴ x = 8 is the solution to the equation.

3 0

3 years ago

A limited-edition poster increases in value each year with an initial value of $18. After 1 year and an increase of 15% per year

Roman55 [17]

Answer:

The required equation is $y = 18(1.15)^x$ .

Step-by-step explanation:

Consider the provided information.

The Initial value of poster = $ 18

After 1 year amount of increase = $ 20.70

With the rate of 15% = 0.15

Let future value is y and the number of years be x.

$y = 18(1.15)^x$

Now verify this by substituting x=1 in above equation.

$y = 18(1.15)^1=20.7$

Which is true.

Hence, the required equation is $y = 18(1.15)^x$ .

7 0

3 years ago

Read 2 more answers