# You are reading our best questions and answers in the problems category

An invasive species is an animal or plant that has populated an ecosystem to the point where it dominates over other plants and animals in the ecosystem. An invasive species can be a species that is not indigenous, meaning that it does not naturally grow in the ecosystem or an indigenous species that dominants the ecosystem and chokes out other species. Invasive species can cause many problems in an ecosystem and need to be controlled and eradicated in some incidences.

The sound of a car backfiring has been compared with a gunshot or firework. It is certainly loud enough to turn heads from quite a distance away. It is not common in newer vehicles equipped with fuel-injection systems, but can still occur under the right conditions.

Here are some fairly basic math problems to test your skills (answers are provided at the end of the post). If you find these too easy, or just want different challenges, check out our fifth grade math problems and basic algebra problems.

Basic Math Questions

- 5 + 2
- 12 + 5
- 55 – 41
- 8 x 2
- 10 x 5
- 5 x 10
- An acute angle _____

Last week I wrote some fifth grade math problems. Today, I am going to put up a few simple algebra problems (of different types) with the answers at the end of the post.

Questions:

First Type: Solving Equations

Solve for x:

- 4x = 8
- 2x + 7 = 15
- x + 6 = 6
- 5 – (x + 2) = 10
- 4x = 7 + 3x
- 2x = 14 + 3x
- 3x = 6

Try these fifth grade math problems (answers at the bottom of the post). Try not to use a calculator!

- What is 75 x 54?
- What is 12 x 19?
- What is 2/4 + 3/4?
- What is 1/2 + 3/4?
- What are the first four prime numbers?
- Is 25 a prime number?