Let c = grams of copper to be added
(grams of silver) / (grams of copper and silver) < = .90
387+%2F+%28c+%2B+387%29+%3C=+.9
387+%3C=+.9%28c+%2B+387%29
387+%3C=+.9c+%2B+348.3
.9c+%3E=+387+-+348.3
.9c+%3E=+38.7
c+%3E=+43g
At least 43 grams of copper must be added
check:
387+%2F+%28c+%2B+387%29+%3C=+.9
387+%2F+%2843+%2B+387%29+%3C=+.9
387+%2F+430+%3C=+.9
.9+%3C=+.9
+4
The oxidation number of C must be +4, to make the oxidation number of the ion the same as its charge.
Answer:
A cancerous or noncancerous mass or growth of abnormal cells in the brain.
Tumors can start in the brain, or cancer elsewhere in the body can spread to the brain.
Symptoms include new or increasingly strong headaches, blurred vision, loss of balance, confusion, and seizures. In some cases, there may be no symptoms.
Treatments include surgery, radiation, and chemotherapy.
Step-by-step explanation:
have great day
Answer:
c is rational
Step-by-step explanation:
it just is
290 * 7 = 1400 + 630 = 2,030
2030 - 7 = 2,023