1.there is a box containing 3 red balls, 2 white balls and 5 blue balls. what is the probability of picking a red ball?
2.simplify 1/3x+y
3.if 12cm on a map represents 60km, what will be the length used to represent 400km on the map?
1. The probability of picking a red ball can be calculated by dividing the number of red balls by the total number of balls in the box.
Probability of picking a red ball = 3/10
2. To simplify 1/3x + y, we need to combine the terms that have the same variables.
1/3x + y = x/3 + y
3. We can set up a proportion to solve for the length used to represent 400km on the map.
12cm : 60km = x : 400km
Cross-multiplying, we get:
60km x = 12cm * 400km
Simplifying, we get:
x = (12cm * 400km) / 60km
x = 80cm
Therefore, 400km on the map will be represented by 80cm.