Exploring Unit 7 Lesson 14: Adding and Subtracting Rational Expressions

The video covers Math 8 Unit 7 Lesson 14, focusing on multiplying, dividing, and estimating with scientific notation. It includes activities on biomass, comparing the mass and number of creatures, and exercises involving the solar system and professions. The lesson emphasizes practice with scientific notation, providing examples and solutions to various problems.

When multiplying 10 to the fifth times 10 to the fourth, what is the result?

• 10 to the 10th power

• 10 to the 20th power

• 10 to the 9th power

• 10 to the 1st power

Which creature is the least numerous?

• Bacteria

• Blue Whales

• Humans

• Ants

How many times more ants are there compared to blue whales?

• 10 to the 7 times more

• 10 to the 3 times more

• 10 to the 5 times more

• 10 to the 13 times more

Which has more mass, all the humans or all the ants?

• Ants

• Cannot be determined

• They have equal mass

• Humans

How many Earths would fit side by side to match the width of the Sun?

• About 1000

• About 10

• About 50

• About 100

How many times further away from Earth is Neptune compared to Venus?

• About 10 times further

• About 100 times further

• About 1000 times further

• About 50 times further

How many Mercury's would it take to equal the mass of Neptune?

• About 200

• About 330

• About 100

• About 500

How many times more nurses are there than doctors?

• About 2 times more

• About 5 times more

• About 10 times more

• About 20 times more

How much money do all doctors make put together?

• About 140 billion dollars

• About 50 billion dollars

• About 200 billion dollars

• About 100 million dollars

Which group makes more money, all military enlisted or all military officers?

• They make the same amount

• Cannot be determined

• Military officers

• Military enlisted