Fernando evaluated the expression below. what was fernando’s error?

C. Fernando incorrectly found the product of -2 and -5.

Step-by-step explanation:

We have been given an image, which represents work of Fernando's evaluation of an expression. We are  asked to find the error in Fernando's work.

Let us evaluate our given expression using order of operations (PEMDAS).

Since we know that product of two negative numbers is always positive, therefore, the product of negative 2 and negative 5 will be positive 10.

Therefore, Fernando incorrectly found the product of -2 and -5 and option C is the correct choice.

a=-8,s20=790

Step-by-step explanation:

s20=10[-16+19xd]

790/10=-16+19d

79+16=19d

85=19d

d=85/19=5