3 years ago

HELP!!!!!!!!!!!!!!!!!!!!!!!!!!

Mathematics

2 answers:

olga55 [171]3 years ago

6 0

I believe the answer is 45.

deff fn [24]3 years ago

4 0

Answer:

I believe the answer is 45.

Step-by-step explanation:

I believe the answer is 45.

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Given f(x)=x^3+5x+k, and x+2 is a factor of f(x), then what is the value of k?

Marat540 [252]

3x^3+0x^2-2x+k:x-2=3x^2+6x+10
3x^2-6x^2
6x^2-2x
6x^2-12x
10x+k
10x-20
k+20
Thus k=-20

6 0

3 years ago

Read 2 more answers

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

Points A, B, and C are collinear and A is between B and C.

olganol [36]

The answer is AB (45)

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3 years ago

What percent is 39 ft of 110 ft

Levart [38]

Answer:

Step-by-step explanation:

7 0

3 years ago

Mr. Thompson had a balance of $283.12 in his checking account at the beginning of the month he wrote checks for $23.09 $7.56 $12

ryzh [129]

Account balance is $123.08

Step-by-step explanation:

Step 1: Balance in Thompson's account = $283.12. Calculate the total amount of checks Thompson wrote in the month.

Total amount of checks = $23.09 + $7.56 + $125.11 + $4.28

= $160.04

Step 2: Calculate his balance.

Account balance = $283.12 - $160.04

= $123.08

8 0

3 years ago