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aleksandr82 [10.1K]
3 years ago
10

What do you think of when you hear "decimal notation

Mathematics
1 answer:
Vera_Pavlovna [14]3 years ago
8 0

Answer:

The notation of decimals is the written form of base 10 place value.

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3x+2y=7 y=3x-19 could someone show me a step by step for this equation for substitution
Vitek1552 [10]

Answer:

\boxed {\boxed {\sf (5,-4)}}

Step-by-step explanation:

We are given the equations:

3x+2y=7 \\y=3x-19

Since we know what y is equal to, we can substitute that expression in for y in the first equation.

3x+2(3x-19)=7

Distribute the 2. Multiply each term inside the parentheses by 2.

3x+(2*3x)+ (2*-19)=7

3x+6x+-38= 7

Combine the like terms (the terms with variables).

9x-38=7

Since we are solving for x, we must isolate the variable. 38 is being subtracted and the inverse of subtraction is addition. Add 38 to both sides.

9x-38+38=7+38 \\9x=7+38\\9x=45

Now x is being multiplied by 9. The inverse of multiplication is division. Divide both sides by 5.

9x/9=45/9\\x=45/9\\x=5

Now we know what x is equal to and can substitute the value into the second equation.

y=3x-19

y=3(5)-19

Multiply.

y=15-19

Subtract.

y= -4

Coordinate points are written as (x,y). Therefore, the solution is (5, -4).

4 0
3 years ago
Read 2 more answers
1 3/5 •1 2/5= Find the value of each expression in lowest terms. That dot between the numbers is times
IrinaK [193]
First multiply them out to improper fractions 1 3/5 changes into 8/5 and 1 2/5 changes into 7/5 multiply them out and you should get 2 6/25.
8 0
4 years ago
The water level of a pond rises an inch every 16 days
Scilla [17]

Answer:

16 weeks

Step-by-step explanation:

7 inches rise

7x16days = 112 days

112 days / 7 days = 16 weeks

5 0
4 years ago
Write a real world situation that could be represented by the system of equations Y equals 4X +10 and Y equals 3X +15
Nezavi [6.7K]
Please elaborate more on your question so I can help you
4 0
4 years ago
41,000.00 minus 23,000.00
inna [77]
18,000.00.This is the answer 

8 0
4 years ago
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