$\left|\begin{array}{ccc}6&7&-1\\3&n&5\\9&11&n\end{array}\right| =0\\\\\\\\6(n^2-55)-3(7n+11)+9(35+n)=0\\\\n^2-2n-8=0\\\\\Delta=36=6^2\\\\n=\dfrac{2-6}{2} =-2\ or\ n=\dfrac{2+6}{2}=4\\$

4 0

3 years ago

Stephen can deliver 14 newspapers in 20 minutes. How many HOURS will it take him to deliver 131 newspaper

LiRa [457]

Answer:

approx. 3 hours

Step-by-step explanation:

14 newspapers in 20 minutes means he can deliver 42 newspapers an hour.

60/42 = 1.4285 newspapers per minute

131 x 1.4285 = 187.1335 minutes = 3.1188 hours

7 0

2 years ago

Appliances & Wares is valuing its inventory of toasters. On May 31st, Appliances & Wares had 23 toasters on hand. What i

ohaa [14]

Hi there
Average cost per toaster
3,278.6÷148=22.15. ..answer
ending inventory value for May
22.15×23=509.45

Hope it helps

4 0

3 years ago

What is a to the -6th power using a positive exponent

pentagon [3]

$a^{-6}=\left(\dfrac{1}{a}\right)^6=\dfrac{1}{a^6}$

5 0

3 years ago