The measure of angle D is 55°, the measure of angle E is 85°, and the measure of angle F is 10x. What is the value of x?

55+85=140

180-140=40

10x=40

divide by ten on each side

x=4

6x = 48

i hope this . 6 cards each and a total of $48. dvide each side by 6 and you will have your answer.

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 -