| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.45 |
| Score | 0% | 69% |
| 2.7 | |
| 2.1 | |
| 4.5 | |
| 1 |
1
What is the next number in this sequence: 1, 4, 10, 19, 31, __________ ?
| 38 | |
| 42 | |
| 54 | |
| 46 |
The equation for this sequence is:
an = an-1 + 3(n - 1)
where n is the term's order in the sequence, an is the value of the term, and an-1 is the value of the term before an. This makes the next number:
a6 = a5 + 3(6 - 1)
a6 = 31 + 3(5)
a6 = 46
Which of the following is a mixed number?
\({5 \over 7} \) |
|
\({7 \over 5} \) |
|
\(1 {2 \over 5} \) |
|
\({a \over 5} \) |
A rational number (or fraction) is represented as a ratio between two integers, a and b, and has the form \({a \over b}\) where a is the numerator and b is the denominator. An improper fraction (\({5 \over 3} \)) has a numerator with a greater absolute value than the denominator and can be converted into a mixed number (\(1 {2 \over 3} \)) which has a whole number part and a fractional part.
What is -7a5 - 7a5?
| 25 | |
| -14a-5 | |
| -14a5 | |
| 14a5 |
To add or subtract terms with exponents, both the base and the exponent must be the same. In this case they are so subtract the coefficients and retain the base and exponent:
-7a5 - 7a5
(-7 - 7)a5
-14a5
Which of these numbers is a factor of 20?
| 4 | |
| 2 | |
| 14 | |
| 18 |
The factors of a number are all positive integers that divide evenly into the number. The factors of 20 are 1, 2, 4, 5, 10, 20.