What is the rule of add 15,subtract 10

answer:

i hope this

step-by-step explanation:

what you have is an explicit formula:

f(x) = (x + 15) - 10

f(x) = x + 5

you want the recursive.   you take the previous number and add 5 to it to get the new number.

f(x + 1) = f(x) + 5

where       f(1) = 4

              f(x) = preceding number

              f(x + 1) = new number

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

happy to

pls mark as brainliest

10000

step-by-step explanation: divide by 2,