Question

help answer alll three​

Answer 1

Step-by-step explanation:

1.

x-1/x=5

so we have to find the cube

(x-1/x)³=5³

x³-(1/x)³-3(x².1/x - x.1/x²)= 125

x³-1/x³ -3(x-1/x)=125

x³-1/x³=125+3(x²-1)

x

2.

let diameter of a rubber ball= x

diameter of a plastic bag= 3x (rubber ball is 1/3 of plastic ball so plastic ball is 3 times bigger)

now ratio of their surface area= 4πr²/4πr²

=4πx²/4π(3x)²

= x²/9x²

=1/9

therefore ratio = 1:9

3.

Here you can do it either way

let L y be 140°

and Lz be 35°

now if you extend the line it'll intersect line CD

which is || AB

let the intersecting point on CD be s

now we have triangle xzs

and we know Ls is the corresponding opposite of 140°

which is 180-140= 40°

Now in ∆ xzs

Lsxz+Lxsz+Lxzs= 180

Lsxz+ 40+35= 180

Lsxz= 180-75= 105°

this

(now if you extend the line z you'll intersect at AB

name it r

such that Lzxy+Lyxr= 180

we know that L yxr is the vertical opposite of L sxr

so, Lzxy + 105= 180

therefore Lzxy = 180-105 = 75°)

or

(you can simply find by

adding L yxz +Lzxs = 180°

where you already know the value of Lzxs,

and yxs is a straight line with x as mid point.)

Answer 2

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Above answer is correct