Check your basic mathematics skills:

1. What is the value of the following expression? $$48-8(2+10/5)$$

2. What is the value of the following expression? $$\sqrt{(12-8{)}^2+(15-8{)}^2+(4-8{)}^2}$$

3. What is the value of x in the equation x + 3 = 35?

4. What is the value of x in the equation x + 13 = 5?

5. What is the value of x in the equation 2x + 3 = 1?

6. What is the positive value of x in the following equation? $$\frac{x}{3}=\frac{12}{x}$$

7. A class has 30 students, 18 of which are interested in data science. What is the proportion of students who are not interested in data science? Express your answer in a decimal.

8. In a bag of 24 apples, 3 are rotten. What is the proportion of apples that are rotten? Express your answer in a decimal.

9. Evalue the expression $$-2.43+1.2(2.5)$$

10. How many values satisfy the following the equation? $$x(x^2-9)=0$$