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3 years ago

Simplify 3(у- 1) +7 completely. А. Зу+6 В. Зу+ 4 С. 3y+10 D. Зу- 3

Mathematics

2 answers:

goldfiish [28.3K]3 years ago

7 0

Use distributive property. 3xY, 3x -1, +7
so the answer is 3y-3+7. you combine like terms and get B. 3y+4

marysya [2.9K]3 years ago

4 0

Answer:

B. 3y + 4

Step-by-step explanation:

Step 1:

3 (y - 1) + 7

Step 2:

3y - 3 + 7

Answer:

3y + 4

Hope This Helps :)

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3 years ago

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Salsk061 [2.6K]

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Step-by-step explanation:

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3 years ago

Explain whether the following given sets are closed under addition:

Ivan

Answer:

Step-by-step explanation:

a) Yes.

$\forall\ a,b\ \in\ B,\ a+b\in B\ (since\ 0+0=0)$

b) Yes

$W=\{0,1,2,3,..,\}\ (whole\ numbers)\\\forall\ a,b\ \in\ 3W,\ a+b\in 3W\\since:\\a\ \in\ 3W \Longrightarrow\ \exists\ k_1\in W | a=3*k_1\\\\b\ \in\ 3W \Longrightarrow\ \exists\ k_2\in W | b=3*k_2\\\\a+b=3*k_1+3*k_2=3*(k_1+k_2) \in 3W\\$

c) Yes

$\forall n\ \in\ \mathbb{N}: \Longrightarrow\ n+1 \in\ \mathbb{N}\\$

d) No

$3\in V , 3+3=6\notin V\\$

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3 years ago