Consider u = {x|x is a negative real number}
which is an empty set?
{x\x e u and x has a negative cube root}
{x|x eu and x has a negative square root}
{x|x e u and x is equal to the product of a positive number and -1}
{xx eu and x is equal to the sum of one negative and one positive number}

the answer is 14ft

step-by-step explanation:

11

step-by-step explanation:

32.50-7.50=25

225/25=11

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -