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3 years ago

Can someone please teach how to do this .

Mathematics

1 answer:

iren [92.7K]3 years ago

6 0

Answer:

Step-by-step explanation:

Let's take for example the first one Al(C2H2O2)

If there is no subscript under the number, the amount of atoms is 1

If we have a subscript, as in this case, the subscript is the number of atoms.

In the example above, there is 1 atom of Aluminium, two of Carbon, two of Hydrogen and 2 of Oxygen. If you have parenthesis and number before them, e.g., 4(Al2O3), you just multiply the parenthesis by the number in front of them, which means 4*2=8 aluminium atoms, 3*4=12 oxygen atoms, the same applies if the number is subscript behind the parenthesis like in fourth example.

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If the after tax total was $214.00 and the tax rate in the area is 7% what was the pre tax subtotal?

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Answer:

$199.02

Step-by-step explanation:

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2 years ago

Read 2 more answers

Classify each number below as an integer or not. -18/9 -11/16 -1.21 -104.41 -10

amid [387]

So, first we need to know that an integer is a whole number that can be - and + (Negative and positive). An integer cannot be a decimal nor a fraction.

So remember this and that's the way we can solve the following.

Number 1 is an integer.

Number 2 is an integer.

Number 3 is not an integer.

Number 4 is not an integer.

Number 5 is an integer.

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3 years ago

The sets of ordered pairs below represent relations.

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Sets II, III, and IV are all representations of functions.

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3 years ago

A line passes through (2,8) and (4,12). Which equation Best represents the line

SVETLANKA909090 [29]

Answer:

y = 2x + 4

Step-by-step explanation:

First, find the rate of change [slope], m = -y₁ + y₂\-x₁ + x₂. Next, you do either\or:

12 = 2(4) + b; 4 = b

8 = 2(2) + b; 4 = b

No matter which ordered pair you use, you will ALWAYS get the same answer, IF you put them in their correct places.

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3 years ago

The length of a rectangle is 6 more than twice its width. The

Whitepunk [10]

Answer:

The answer is option (C). The width of the rectangle=6 inches

Step-by-step explanation:

Step 1: Determine the dimensions of the rectangle

width=w

length=w+6

Step 2: Determine the perimeter of the rectangle

P=2(L+W)

where;

P=perimeter

L=length

W=width

In our case;

P=36 inches

L=w+6

w=w

replacing;

2(w+w+6)=36

2(2 w+6)=36

4 w+12=36

4 w=36-12=24

4 w=24

w=24/4=6

W=6 inches

L=6+6=12 inches

The width of the rectangle=6 inches

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4 years ago