The expression 12xyz – 45 is a a. monomial. b. constant. c. binomial. d. trinomial.

Your answer is C. Binomial. :)

Terms are things in polynomials seperated by plus signs (a minus sign is adding a negative, so like a-b=a+(-b))

monomial has 1 term
bionomial has 2 terms
trionomial has 3 terms
constant is just like -34 or 23, no variable

so
12xyz-45
12xyz+(-45)
2 terms
bionomial
C is answer

im guessing you wanted me tho find the common denominator of 7 8/10 and 1  1/4 the LCD would be 20.

Step-by-step explanation:

Solution:

Rewriting input as fractions if necessary:

78/10, 5/4

For the denominators (10, 4) the least common multiple (LCM) is 20.

LCM(10, 4)

Therefore, the least common denominator (LCD) is 20.

Calculations to rewrite the original inputs as equivalent fractions with the LCD:

78/10=78/10×2/2=156/20

5/4=5/4×5/5=25/20