is 22 correct? How do i do 23 and 24?

22 A cell phone company charges $60.00 a month for up to 1 gigabyte Use this space for of data. The cost of additional data is $0.05 per megabyte. If d computations. represents the number of additional megabytes used and c represents the total charges at the end of the month, which linear equation can be used to determine a user's monthly bill? (1) c = 60 - 0.05d (3) c = 60d - 0.05 (2) c = 60.05d (4) c = 60 + 0.05d 23 The formula for the volume of a cone is V = _nich. The radius. r. of the cone may be expressed as (1) 3V ith (3) 3 th (2) V ( 4) 1 V 3 Vich 24 The diagrams below represent the first three terms of a sequence. Term 2 Term 3 Term 1 16 20 Assuming the pattern continues, which formula determines an, the number of shaded squares in the nth term? (3) an = 4n + 4 (1) an = An + 12 (4) an = 4n + 2 (2) an = 4n + 8 Algebra