1.9996 by 2 significant numbers

What's 5n+7=21 it's a two step equation

Word from for 233,740

Barry bought 21 stamps from a hobby shop. he gave 3/7 of them to his sister, how many stamps did he have left?

Tyler is making a history project and needs two poster boards. He cuts one measure 42.25 inches in length. He cuts the second to measure 34.75 inches in length. What is the difference between the two lengths of the poster board?

A Rectangle Measures 11Cm By 30 Cm. What is its area?

What is a balanced equation using numbers 9,7,2,1,6?

Part of the population of 10,800 hawks at a national park are building a nest. A random sample of 72 hawks shows that 12 of them are building a nest. Estimate the number of hawks building a nest in the population.

Olivia has $220 to buy presents for her 3 sisters and 2 nephews. She wants to spend $10 more on each sister than she spends on each nephew.

Katherine is working two summer jobs, making $16 per hour lifeguarding and making $6 per hour walking dogs. In a given week, she can work a maximum of 15 total hours and must earn at least $160.

What is 0.002 1/10 of