TRUE or FALSE 1. Technologists start with new materials and work out how to use them to design new things for a certain purpose.

2. A pen should be used to write the title and axes of a graph.

3. Predicting is making a general statement about what you expect to happen.

4. Corrosive chemicals will destroy living cells as well as other substances such as equipment used in the laboratory

1. True

2.Fqlse

3.True

4.True

n = 20

Step-by-step Explanation:
When dealing with ratios, there is always most likely a second number given to you. This number is going to be 1.
When looking for n, you have to look for all of the numbers, in this case there is only two.
1 is the hour, so now you just need the 20 minutes.
If the ratio is 1:n, this means that n would have to equal 20.
1:20