6. The mass of Mars is 6.42 x 10^23 kilograms. The mass of Mercury is 3.3 x 10^23 kilograms. a. What is the combined mass of Mars and Mercury expressed in scientific notation? b. What is the difference in the mass of the two planets expressed in scientific notation? PLEASE ANSWER WITH COMPLETE STEPS;) THANK YOU. (I giving 20 pts)

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality