Hey everyone! Pls help me.need answers asap!

x will be 1/5

1 st ans is 1/3

2nd ans is 1/5

3rd ans is 5/3

hope it may help u

Step-by-step explanation:

1st

7/x=21

21x=7

x=7/21

x=13 answer

2 nd

30=6/x

x=6/30

x=15 answer

3rd

5/x=3

x=5/3 answer

#op Nitin

answer: the answer is (b) amie should have multiplied

step-by-step explanation: given a sphere and a cylinder with same radius and height.

let, 'r' be the radius of the cylinder and sphere and 'h' be the height of the cylinder. according to the question,

r = h.

now, the volume of the sphere will be

and the volume of the cylinder will be

therefore, we have

thus, ammie should have multiplied the volume of the sphere

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!