msjsnell29
19.04.2020 •
Mathematics
Line $j$ is perpendicular to $\frac{y}{3}+\frac{2x}{5}=2$. What is the slope of line $j$?
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Ответ:
Step-by-step explanation:
The slope of
is -3. When a line is perpendicular to another, it's slope will be the negative reciprocal of the other line. -3 could also be written as 
, and if you take the reciprocal, it would be 
, and the negative form of this (since a negative plus a negative is a positive) would be 
.
Ответ:
1521 grams.
Step-by-step explanation:
It is given that in a certain chemical, the ratio of zinc to copper is 4 to 13. A jar of the chemical contains 468 grams of copper.
Ratio of zinc to copper = 4:13
Let the amount of zinc and copper be 4x and 13 respectively.
Copper = 468 grams
Divide both sides by 4.
The value of x is 117.
The amount of zinc is
Therefore, the amount of zinc in the chemical is 1521 grams.