Is a collection or a stream of rays of light. And it is represented by a number of rays.
a. A ray of light​

divide the right side by the left side

0.024÷1.2=0.02 for example

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

that the claims meet official rules.

don't misinterpret the claims

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y