How would I solve these?

The Mars Rover has a mass of 175.4 kg. If the acceleration due to gravity on Mars' surface is -3.75 m/s', the magnitude of the Rover's weight on Mars, expressed in scientific notation, is b '10WN. The value of b is . (Record all three digits of youranswer on the answer sheet.) On planet 518c, a 45.0-g golf ball has a weight of 0.981 N. The gravitational field strength on planet 518c is N/kg. (Record your three-digit answer on the answer sheet.) Use the following information to answer the next question. Moon Earth O Sun - 3.84x10 m - 1.50x10u m The gravitational force exerted on Earth by the Moon is 1.9 . 102 N [toward the Moon's centre]. The gravitational force exerted on Earth by the Sun is 3.5 * 1022 N [toward the Sun's centre]. The ma Cude of the net gravitational force exerted on Earth by the Moon and the Sun is a.b * 10 d N. The values of a, b, c,andd are. and [Record all four digits of your answer on the answer sheet.) Use the data supplied in the table to determine the magnitude of the ratio of a 60-kg student's weight on Mars to her weight on Earth's Moon. (G - 6.67 x 101' N:m'/kg?) Celestial Body Mass Mean Radius Mars 6.42 1023 kg 3.40 - 106 m Earth's Moon 7.35 . 10 2 kg 1.74 100 m Select one: 0.437 1.00 Turns 0.224 1.00 C. FEW 2 29 1.00 F. 1.00 Planet X has the same mass as planet Earth but twice the diameter. What is the ratio of the force of gravity at the surface of planet X to the force of gravity at the surface of planet Earth? Select one