X and y last one

i put all the points i could on this question
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Step-by-step explanation:

15^2-12^2

225-144

81

√81=9

21÷9=2.3333(recurring)

2.33333×15=x

X=34.999

or X=35 to 1 d.p

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step-by-step explanation:

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles