The answer should be z2-144
Answer:
(a) How many grams of copper are in the resulting mixture?
= 160 grams
(b) What percentage of the resulting mixture is copper?
= 61.5%
Step-by-step explanation:
(a) How many grams of copper are in the resulting mixture?
From the question: Suppose that a certain alloy is made by mixing 70 grams of an alloy that contains 12% copper with 90 grams of pure copper.
The number of grams of copper in the resulting mixture = 70 grams + 90 grams = 160 grams
(b) What percentage of the resulting mixture is copper?
70 grams of an alloy that contains 12% copper = 70 × 12%
= 70 grams × 0.12
= 8.4 grams
The number of grams of copper in the resulting mixture = 160 grams
The percentage of the resulting mixture that is copper is
=( 8.4 grams + 90 grams of pure copper/160) × 100
= 98.4/160 × 100
= 61.5%
Answer:
4x^2 + x
Step-by-step explanation:
just multiply x to each of the terms.
When two fractions have the same denominator, you can compare which fraction is greater by just comparing the numerators.
For example, if you have 2/5 and 3/5, the denominators are the same. So you can just look at the numerators. 3 is greater than 5, so 3/5 is greater than 2/5.
The reasoning to this is that the two numbers are divided by the same number (5), so you can compare the original numbers (numerators).
If the given variables are 127 hours of sleep per week for a
Giant Armadillo, and 98 hours of sleep per week for a Platypus, to determine
which animal gets the most sleep, first multiply the total hours of sleep of
each animal per week to the total number of weeks In a year, which is 52. Once
you get the answers, which are 6,604 hours of sleep in a year for the Giant
Armadillo and 5,096 hours of sleep in a year for a Platypus. You subtract 6,604
and 5,096 together to get the answer, which is 1,508. Therefore we conclude
that that the Giant Armadillo has 1,508 hours more hours of sleep than a
Platypus in a Year.