40% of _ =$10: 00 a $0.25 b $4.00 c $25.00 d $40.00 e none of these

C $25.00

Step-by-step explanation:

I don't have much time, but 0.4*25 = 10.

Set 2/5 (40/100) to equal 10/x.

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 -

step-by-step explanation:

for volume, add base x height x width