Combine the like terms to make a simpler expression: 4r+14-r-6

Answer this question i need as soon as possible

Will mark ! (10 points also! ) if x varies inversely with y and x =6 when equals y= 10, find y when x=8 a. y=4.8 b. y=7.5 c. y=40/3 d. y=4/15

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20