Y8 - Formative - Powers, Variables, Prime Factorization

Four squared and one cubed are:

• 2⁴ and 1³

• 4² and 3¹

• 4² and 1³

• 2⁴ and 3¹

2 raised to the power of 5 is:

• 16

• 32

• 48

• 64

10⁴ - 10³ =

• 9 009

• 9 000

• 90 000

• 9 090

Select all the right answers about 2⁴ :

• We read it as "two to the power of four".

• Its standard form (result) is divisible by 8.

• Its expanded form is 2 x 2 x 2

• This power (result) is a multiple of 6.

Remember that 5x is "five times x".

So, evaluate 5x when x = 15:

• 75

• 95

• 65

• 85

An algebraic expression is 4x - 3.

When x = 8, its value is:

• 19

• 29

• 31

• 21

If 3a + 2b is equal to 7, a and b need to be equal to:

• a = 1 and b = 2

• a = 1 and b = 1

• a = 2 and b = 1

• a = 2 and b = 2

When you calculate 2x + 4 knowing that x = 2.5, your result will be N. Choose all the correct options about N.

• N is a prime number

• N is an odd number

• N is a multiple of 3

• N is divisible by 9

The prime factorization of 28 is:

• 2 x 2 x 7

• 2 x 2 x 3

• 3 x 3 x 5

• 2 x 3 x 7

The prime factorization of 80 is:

• 2 x 3² x 5

• 2³ x 11

• 2⁴ x 5

• 2 x 5²