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3 years ago

3x + 6 + 19x = 3x + 19x + 6Which property?

Mathematics

2 answers:

andre [41]3 years ago

4 0

Answer:

Associative property of addition

Step-by-step explanation:

This is the property used here. It states that the sum of three or more quantities will be same regardless of the order in which they are added.

grin007 [14]3 years ago

3 0

Answer:

Associative Property Is Correct

Step-by-step explanation:

The associative property of Addition states that the Sum of three or more numbers remains the same regardless of how the numbers are grouped.

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A metalworker has a metal alloy that is 15% copper and another alloy that is 75% copper. How many kilograms of each alloy shou

lisov135 [29]

48 kilograms of 15 % copper is combined with 72 kilograms of 75 % copper to create 120 kg of a 51% copper alloy

Solution:

Let "x" be the kilograms of 15 % copper

Then, (120 - x) be the kilograms of 75 % copper

Then, according to question,

"x" kilograms of 15 % copper is combined with (120 - x) kilograms of 75 % copper to create 120 kg of a 51% copper alloy

Thus we frame a equation as:

15 % of x + 75 % of (120 - x) = 51 % of 120

Solve the equation for "x"

$15 \% \times x + 75 \% \times (120-x) = 51 \% \times 120\\\\\frac{15}{100} \times x + \frac{75}{100} \times (120-x) = \frac{51}{100} \times 120\\\\0.15x + 0.75(120-x) = 0.51 \times 120\\\\0.15x + 90 - 0.75x = 61.2\\\\0.6x = 90 - 61.2\\\\0.6x = 28.8\\\\Divide\ both\ sides\ by\ 0.6\\\\x = 48$

Thus 48 kilograms of 15 % copper used

Then, (120 - x) = (120 - 48) = 72

Thus, 72 kilograms of 75 % copper is used

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3 years ago

Triangle ABC is rotated 45° counterclockwise about vertex A to obtain triangle XYZ. If the m∠ABC is equal to 30°, what is the m∠

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Answer:

i think 30

Step-by-step explanation:

the best choice

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iris [78.8K]

Answer:

Step-by-step explanation:

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