From 3 hours to 30 minutes percentage

A decrease to 30 minutes from 3 hours corresponds to a 83.3% relative decrease, or a reduction to a time period that is 16.7% of the original period (depending on a more precise meaning of your question, see below)

Steps:

Relative decrease from y to x:

100*(y-x)/y in %

So y = 3 hr and x = 30 min. Rewrite to fractions: x=6/2 hr, y=1/2 hr

rel decrease =  

Percentage of reduced time period:

the 30 minutes time period corresponds to of the full period of 3hr, or 16.67% (this is in case your question was asking for the percentage the remaining amount represents of the total amount).

Let me know if you have questions.

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!

m∠a is 90°

m∠b is 40°