Marcus finds that (3x^2-2y^2+5x)+(4x^2+12y-7x)= 7x^2-10y^2-2x what error did marcus make?

a: he combined the terms 5x and –7x incorrectly.
b: he combined the terms 3x^2 and 4x^2 incorrectly.
c: he combined the terms –2y^2 and 12y^2 incorrectly.
d: he subtracted the polynomials instead of adding.

Answer asap ill give ! ’ a sample of radioactive material decays over time. the number of grams, y , of the material remaining x days after the sample is discovered is given by the equation y = 10(0.5)^x. what does the number 10 represents in the equation? a. the half-life of the radioactive material, in days b. the amount of the sample, in grams, that decays each day c. the time, in days, it will take for the samples to decay completely d. the size of the sample, in grams, at the time the material was discovered

Find the greatest common factor of the followig monomials 46g^2h and 34g^6h^6

One file clerk can file 10 folders per minute. a second file clerk can file 11 folders per minute. how many minutes would the two clerks together take to file 672 folders?