Which of these statements about algebra are true?

a. algebra uses abstract symbols to represent concrete elements in the real world.

b. in an algebraic equation, the same variable can represent two different unknowns.

c. many great mathematicians were also philosophers.

d. an algebraic expression contains an equal sign, but an algebraic equation does not.

e. the same variable can represent two different unknowns in two different algebraic expressions.

A.

Step-by-step explanation:

The symbols are usually letters.

The most commonly used are x, y and z.

step-by-step explanation:

i think something is missing in your question because y-1=(x-12) would not pass through the point (-4,-3). because if you replace x by -4 your are supposed to find y=-3 which is not the case her. if you replace x by -4 you find =-15.

i assume the right equation is y-1=1/4*(x-12) because this one is passing through both your points (if you are interested to know how i found that out i can tell you).

in this equation if i replace x by -4 i find y=-3 and if i replace x by 12, i find y=1 so the line representing this equation is passing through those 2 points.

then the standard form of the equation is finding an expression of y in function of x

y-1=1/4*(x-12)

y=x/4-3+1

y=x/4-2

hope that .

do you confirm there was a mistake in the question?

a = 3.14

b = 18

c = 18/5 or 3.6 or 3 3/5

step-by-step explanation: