What is the exponent in the expression 4 superscript 5?
4
5
9
20

80x^8−68x^6+16^5−20x^4−4x^3+8x^2

hope i'm right lol

other answer is correct. i had used the radius of the radius somehow. a website:

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 -