If the relationship is proportional, what is the missing value from the table? -3
-5
-7
у
9
?
21
-18
-15
O 15
O 18

Plz hurry evaluate the expression a+b where a=8 and b=19

I’m still confused on how to work the percentages

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.