When is etimation an effective way to determine an answer

How do you solve this? |6x|+3=21

An omline newspaper had 350080 visitors in october 350489 visitors in november, and 305939 visitors in december. what is the order of the mo th greatest to least numbrr of visitors?

At the movie theatre, child admission is 5.20 and adult admission is 9.30 . On Tuesday, twice as many adult tickets as child tickets were sold, for a total sales of 785.40 . How many child tickets were sold that day?

Find the radius and the circumference to the nearest hundredth when d ≈ 3.8 in.

Find the exact value of sec 5pi/4.

The actual distance between two villages is 120 kilometers. On a map of the area, 0.5 centimeter represents 2 kilometers. What is the distance between the villages on the map?

You buy 5 tickets to a concert for you and your friends. You pay $170, including a $20 service charge. How much does one ticket cost?

What is 1.2 % of 0.5?

Jeff can win the game if he rolls 11 on the two number cubes. If he rolls an even sum, however, he will lose his next turn. What is the probability that he will win the game? What is the probability that he will lose his next turn?

Suppose 60 cars start at a car race. in how many ways can the top 3 cars finish the race?