Work out the size of angle DEF, You must give a reason for your answer (Angles are on the picture below)

420°

Step-by-step explanation:

<DEF = 1/2 × 150°

<DEF = 75°

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

mark brainliest!