4 years ago

Seven times a number plus the sum of three and twice a number is 30.

Mathematics

1 answer:

ololo11 [35]4 years ago

8 0

Answer:

A number is 3

Step-by-step explanation:

x*7+(3+x*2)=30

9x+3=30

9x=27

x=3

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<h2>Intersection and Union of Sets</h2><h3>Answer:</h3>

$A \cup B = \{ a, b, c, d, e \}$

$B \cap C = \{ d, e \}$

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<h3>Step-by-step explanation:</h3>

Given:

$A = \{ a, b, c, d \}$

$B = \{ b, d, e \}$

$C = \{ d, e, f \}$

The Union ( $\cup$ ) of sets $A$ and $B$ is just a set containing all the elements of sets $A$ and $B$ . However, elements that are present in both sets should not repeat in the Union of Sets as the elements of a set should distinct be from each other.