A. Who was the first English mathematician who first used the modern symbol of equality in 1557? To get the answer, compute the sums of the given exercises below. Write the letter of the problem corresponding to the answer found in each box at the bottom. A. 25+95= 0. -120+-35= R. -65+-40= C. 30+-20= 0. 45+-20= E. 47+98= R. 65+75= T. 16+-38= B. 78+-15= E. 38+-15= R. -165+85= E. -75+20= D. 110+-75= R. -65+-20=