Answer:
25%
Step-by-step explanation:
1 white car + 3 black cars
4 cars in total
1 out of 4
1/4 = 0.25
25%
32 16÷2=8×4=32 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The mistakes that Joan made are:
- The y-axis does not start from zero.
- The width of the bars are not equal.
- The space between the bars are not equal.
<h3>What is a bar chart?
</h3>
A bar chart is a graph that shows the numerical values of variables represented by the height rectangles of equal width.
In a bar graph, the rectangles must be of equal width and the space between each bars must be equal.
Please find attached an image of the bar chart. To learn more about bar charts, please check: brainly.com/question/18092827
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Hi,
Let's say we need x mg from 1st compound, and y mg from 2nd compound.
0.20 × x + 0.40 × y = 40mg
0.30 × x + 0.20 × y = 30mg
0.20(x + 2y) = 40. => x + 2y = 200 => 2y=200-x
0.10(3x +2y) = 30. => 3x + 2y = 300
3x + (200 - x) = 300
2x = 100
x =50mg
50 + 2y = 200
2y = 150
y =75mg
4x-1=2x+5
4x-2x=5+1
2x=6
x=3