Ajeweler has five rings, each weighing 18 grams, made of an alloy of 10% silver and 90% gold. he decides to melt down the rings and add enough silver to reduce the gold content to 45 %. how much silver should he add?

Five rings, 18 grams each, so the total is 18*5=90 grams
suppose he adds x grams of silver, the total weight will be 90+x grams
out of these 90+x grams, 45% of it is gold, so the amount of gold is 0.45(90+x)
this amount of gold is the same as the old amount, which is 90% of 90=81, because no gold was added.
so we have an equation: 0.45(90+x)=81
solve: 90+x=81÷0.45=180
x=90
He needs to add 90 grams of silver.

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.

0=6x+2y+10 is equivalent to the simplified form: y= -3x - 5• parallel lines always have the same slope, different y intercept knowing this, we can say the slope, or m of the line parallel to y= -3x - 5 is -3.m= -3 hope this could !