Choose an answer below. a) ∠2 is the only angle of elevation; ∠3 is the only angle of depression b) ∠1 is the only angle of elevation; ∠4 is the only angle of depression c) ∠1 and ∠2 are angles of elevation; ∠3 and ∠4 are angles of depression d) ∠2 and ∠4 are angles of elevation; ∠1 and ∠3 are angles of depression

the infinity sign

step-by-step explanation:

9 x 8 divided by (5-3)=36

the radius is 2 times the diameter.

step-by-step explanation:

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 -