3 years ago

Which of the following changes is a chemical change? A ice me

Mathematics

1 answer:

Talja [164]3 years ago

5 0

Answer:

Step-by-step explanation:

The question got caught off. Can't read any of the other examples. I can tell you though that ice melting is a physical change, not a chemical change.

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A store owner uses a selling price of 125%of the cost of an item. If a pair of jeans has a sales price of 33.50, what cost does

Alina [70]

Answer:

It would be $62.62 because basically you want to do 52.50 times 1.25

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2 years ago

Find the determinant of this matrix:

Bogdan [553]

Answer:

Step-by-step explanation:

$\left[\begin{array}{ccc}a&b\\c&d\end{array}\right] = ad-bc$

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2 years ago

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Use the figure to answer the question.

Kruka [31]

Answer:

the correct answer is 30

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3 years ago

Write an equation in slope-intercept form for the line passing through the pair of points.

damaskus [11]

Answer:

Step-by-step explanation:

The slope-intercept form of an equation of a line:

$y=mx+b$

m - slope

b - y-intercept

The formula of a slope:

$m=\dfrac{y_2-y_1}{x_2-x_1}$

==========================================

We have the points (-1, 2) and (4, -3).

Calculate the slope:

$m=\dfrac{-3-2}{4-(-1)}=\dfrac{-5}{5}=-1$

Put the value of the slope an the coordinates of the point 9-1, 2) to the equation of a line:

$2=(-1)(-1)+b$

$2=1+b$ subtract 1 from both sides

$1=b\to b=1$

Finally:

$y=-x+1$

7 0

3 years ago

I thought of a two-digit number. The unit digit of my number is a prime number, and the tens digit is four times as big as the u

denis-greek [22]

let the number is 10x + 3.

then sum of its digits = x + 3.

from given condition, we have

x+3 = (1/7)* (10x + 3)

=> 7x + 21 = 10x + 3

=> 3x = 18

=> x = 6

therefore the number is 63.

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3 years ago