Two spies have to communicate using a secret code. They need to create exactly 30 possible precoded messages, using a single number and letter. Which structure should the code have? Select a number from {1, 2, 3, 4} and a vowel. Select a number from {1, 2, 3, 4, 5} and a vowel. Select a number from {1, 2, 3, 4, 5, 6} and a vowel. Select a number from {1, 2, 3, 4, 5} and a consonant.

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step-by-step explanation: ; )

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )

you'll just earn points here

step-by-step explanation:

time is equal to distance over rate so

t = d/r

need a little bit more information for the second question.