What force is needed to accelerate a 56Kg mass across a surface with an acceleration of 7m/s2

Which triangle congruence postulate or theorem justifies my claim that the steps i made using construction paper and scissors produce an isosceles triangle? was it sss, sas, asa, aas, or hl?

What is the measure of angle afe? 79 81 91 99

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?