Suppose a certain series of gymnastic moves takes 35 seconds to complete. if a gymnast does that series seven times in a row, how long does it take her to complete them all?

  4 minutes 5 seconds

Step-by-step explanation:

Without additional information, we have to assume that one sequence can begin immediately after another, and that each takes the same amount of time. The total time for 7 sequences is 7 times the time for one sequence.

  7 × 35 seconds = 245 seconds = 4 minutes 5 seconds

__

There are 60 seconds in a minute.

d? maybe

step-by-step explanation:

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4