Jada is buying 4 stamps that cost $0.49 each. how can rounding be used to estimate the total cost of the stamps?
since each stamp is about $0.50, the total cost is approximately 4 + 0.5 $4.50.
since she is buying about 10 stamps, the total cost is approximately 10 × 0.49 = $4.90.
since each stamp is about $0.50, the total cost is approximately 4 x 0.5 = $2.00.
since she is buying about 10 stamps, the total cost is approximately 10 +0.49 = $10.49.

c

Step-by-step explanation:

four individual stamps that cost nearly 50 cents

50+50+50+50=200

so the final cost is nearly 2.00

please provide thanks or brainliest if helpful :)

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 -