Which of the following formulas is not entered correctly?

A.

=10+50

B.

=B7*B1

C.

=B7+14

D.

10+50

Correct answer is D

A formula always starts with an equal sign (=), which can be followed by numbers, math operators (such as a plus or minus sign), and functions, which can really expand the power of a formula.
Here in option D 10+50 there is no equal sign (=), so it is not correct.