How many triangles would be in the 57th figure?

Figure One:

3 triangles

Figure two:

5 triangles

FIgure three:

7 triangles

115

Step-by-step explanation:

Consider the sequence of triangles

3, 5, 7

There is a common difference between consecutive terms, that is

d = 7 - 5 = 5 - 3 = 2

This indicates the sequence is arithmetic with n th term

= a₁ + (n - 1)d

where a₁ is the first term and d the common difference

Here a₁ = 3 and d = 2, thus

= 3 + (56 × 2) = 3 + 112 = 115

answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8