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Thx! That did help! 

wait, i think im wrong

so we know that 1000 grams are in a kilogram, since the material costs $22000 per kilogram, we just multiply 250 by 1000, then we just multiply 250000 by 22,000 to get the total cost! Hope this helps, whymenotsmart^m^

Determinant of the quadratic formula  (b^2-4ac)  must equal zero for two equal roots

(   (-3k)² - (4)(k+2)(k) ) = 0

9k² - 4k² - 8k = 0

5k^2 - 8k = 0

Quadratic formula shows k = 1.6     or  0

its ok

$22,000, sorry I don't know why it didn't show that

x²   =  16² +30²  - 2 (16)(30) cos 30    

so at what cost per kilogram??

yea i know i saw that...

If by "distinct four-digits" you mean "no repeats allowed", then the answer is =0 or none! if you allow repeats as as 1126, then you have a total = 36 such numbers.

1126  1134  1143  1162  1216  1223  1232  1261  1314  1322  1341  1413  1431  1612  1621  2116  2123  2132  2161  2213  2231  2312  2321  2611  3114  3122  3141  3212  3221  3411  4113  4131  4311  6112  6121  6211  Total =  36

Hey guest, if you want an explanation, you can use this website>>>

https://www.symbolab.com/solver/step-by-step/%5Cleft(x-4%5Cright)%5Cleft(x-7%5Cright)%20%2B%20%5Cleft(3-x%5Cright)%5Cleft(2%2Bx%5Cright)

Your Welcome!

oh i see

The answer is -10x+34. You got it correct.

yesterday i posted 1000 points but look how much now, i earned 50 so far so....

i got downvoted by a lot of guests, so !

hey mathwiz pro is back!

Hello!

is this wrong, guest, tell me if it is.

−10x+34 is the answer.

1134
1143
1223
1232
1314
1322
1341
1413
1431
2123
2132
2213
2231
2312
2321
3114
3122
3141
3212
3221
3411
4113
4131
4311

==> 24 numbers