Astudent wrote that there are two terms in the expression 3p - (7 - 4q). explain the student's error.

The student wrote that there are two terms in the expression 3p - (7-4q).
However, if you are going to evaluate the expression, it has three terms. Observe the expression below. 
3p - (7-4q)
3p- 7 + 4q

Expressions are symbols, numbers and operators (such as +, ×, ÷ and -) grouped together that show the value of something.
Example: 4× - 7 is an expression. In 4x-7 =5, 4x, 7, and 5 are called terms.

answer:

a

step-by-step explanation:

we require to find ac using pythagoras' identity

the square on the hypotenuse is equal to the sum of the squares on the other 2 sides, thus

ac² + 12² = 40²

ac² + 144 = 1600 ( subtract 144 from both sides )

ac² = 1456 ( take the square root of both sides )

ac = = = 4

tan a = = =

= × = → a