Perform the indicated operation. Show all necessary work. (a) −2- (-9)
(b) −2-9
(c) −2-(-9)-(2)

b is the answer ;))

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

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.