When is it logical to use 22/7 instead of 3.14 for pi

Consider a collection of envelopes consisting of 3 red envelopes, 2 blue envelopes, 2 green envelopes, and 3 yellow envelopes. If three envelopes are selected at random, without replacement, determine the probability that they are all red envelopes.

Trevor rode of a mile every minute. How many minutes did it 16 take him to ride 20 miles? Roundyour answer to the nearest minute.

Evaluate the expression. - 5g - 6 for g = - 2

V=r^2+R^2h; Solve for R

Evaluate the expression. 6 · (5+2) a. 17 b. 32 c. 42 d. 60

What is the answer for x in x/5 = 7

Can the numbers 1 3 5 7 make two numbers whose product is 1767

Jamal is making pancakes. He has 6 3/4 cups of batter, but he needs a total of 12 cups. How much more batter does Jamal need?

A surfer recorded a maximum wave height each day at the beach for 10 days. The results are shown in this dot plot

Edith wants to plan a dinner for one day of the week. She decides to put all the days of the week once into a hat. If she chooses one day a random, what is the probability that she chooses a weekday?