Two cargo trains are linked together, making of a total of 22 cars. the cars from one of the trains are carrying 15 tons each, and those from the other train are carrying 20 tons each. if the total cargo weight ranges from 380 to 400 tons, what is the range of the number of 20 tons cars? (fill in the equation) let x be the number of 20 tons cars. 380 < 15 ( ) + 20 < 400

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all three statements are true

step-by-step explanation:

a shipping fee of 5% is charged online with every item purchased online

first let's just take each option and calculate them based on this, to see if the answers matched

keith buys a 40 dollar book

40 x 0.05 = 2

therefore there will be a two dollar fee on keith's book

40 + 2 =42

the first statement is true

a chair costs $80

80 x 0.05 = 4

80 + 4 = 84

the second statement is true

george buys a 20 dollar calculator

20 x 0.05 = 1

20 + 1 = 21

the third statements are true

all three statements are true