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3 years ago

Help please!!!!!!!!!!!!!!!!!!!!!!

Mathematics

1 answer:

Rudik [331]3 years ago

6 0

Answer:

27.7% if I am correct, but I am confident I am

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Potassium fluoride is used for frosting glass. calculate the molarity of a solution prepared by dissolving 78.6 g of kf in enoug

melisa1 [442]

There are a number of ways to express concentration of a solution. This includes molarity. Molarity is expressed as the number of moles of solute per volume of the solution. We calculate as follows:

Molarity = 78.6 g KF ( 1 mol / 58.1 g ) / .225 L = 6.013 mol / L KF solution

3 0

3 years ago

Select the correct answer.

lorasvet [3.4K]

Answer:

A. 5x^2 - 2x - 12 = 0

Step-by-step explanation:

The base is x feet.

The height is 2 less that 5 times the base.

The height is 5x - 2.

The area is 12.

The area is base * height / 2.

area = bh/2

area = x * (5x - 2) = 12

5x^2 - 2x = 12

5x^2 - 2x - 12 = 0

8 0

3 years ago

Read 2 more answers

Given that x overbarequals3.6667, s Subscript xequals2.0656, y overbarequals4.2167, s Subscript yequals1.5613, and requalsne

Shtirlitz [24]

Answer:

$y = 0.7063x+2.7790$

Step-by-step explanation:

Given that

$x bar = 3.6667\\s_x= 2.0656\\y bar = 4.2167\\s_7 = 1.5613\\r = -0.9344$

We have slope of linear regression line is

$a=r*\frac{s_y}{s_x} =0.9344(\frac{1.5613}{2.0656} )\\=0.7063$

So regression line would be of the form

$y-4.2167 = 0.7063(x-2.0656)$ (since it passes through xbar, y bar)

$y = 0.7063x+2.7790$

is the equation of regression line.

6 0

4 years ago

1. 1/2 x4

Leviafan [203]

Answer:

Question one: 2
Question two: 3

Step-by-step explanation:

Given the following questions:

$\frac{1}{2} \times4$
$\frac{3}{4} \times4$

In order to find the answers, we need to remember that every integer has an invisible denominator of one. Then we simply multiply the numerators by the numerators and the denominators by the denominators.

Question one:
 $\frac{1}{2} \times4$
$4=\frac{4}{1}$
$\frac{1}{2} \times\frac{4}{1}$
$1\times4=4$
$2\times1=2$
$=\frac{4}{2}$

Simplify by reducing:
$\frac{4}{2}$
$\frac{4}{2} \div2=\frac{2}{1} =2$
$=2$

Question two:
 $\frac{3}{4}\times4$
$4=\frac{4}{1}$
$\frac{3}{4} \times\frac{4}{1}$
$3\times4=12$
$4\times1=4$
$=\frac{12}{4}$

Simplify by reducing:
$\frac{12}{4}$
$=\frac{12}{4}\div4=\frac{3}{1} =3$

Your answers are "2 and 3."

Hope this helps.