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1. If $a \star b = 2a + 3b $ for all a and b, then what is the value of $4 \star 3$?

 

2. Define $\#N$ by the formula $\#N = .5(N)+1$. Calculate $\#(\#(\#50))$.

 

3. If $a+b=8$, $b+c=-3$, and $a+c=-5$, what is the value of the product $abc$?

 

4. Davey Q. decides to factor the number 756 into primes. After doing so, he makes a list from this factorization, including each prime in the list as many times as it appears in the factorization. What is the mode of his list?

 

P.S: Plz label questions 1-4 when giving answers~

 Jul 13, 2020
 #1
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1. a \star b= 2a+3b

We plug in 4 and 3 for a and b. We have:

4 \star 3=2(4)+3(3)

4\star3=8+9

4\star3=17.

 

2. We plug in 50 for N in the given equation. Our answer is 8.

 

3. We can add all  equations together to get 2a+2b+2c=0. Then a+b+c=0. c must be -8, a must be 3, and b is 5. The product of abc is -8(3)(5)=-8*15=-120.

 

4. We prime factorize 756 to get 2^2 • 3^3 • 7. Mode is the number that appears most in the set. Since 3 appears 3 times in the prime factorization, which is the most, 3 is the mode of his list.

 Jul 13, 2020
 #2
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okay so the answer is 8

 Jul 13, 2020
 #3
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Guest, you didn't even say for which question the answer is 8...

gwenspooner85  Jul 14, 2020

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