If the average daily rainfall for the last seven days is (3x +0.5) cm write an algebraic expression for the total rainfall for the whole week

21x + 3.5

Step-by-step explanation:

the average is calculated as

average = = 3x + 0.5 ← multiply both sides by 7

total = 7 × (3x + 0.5) = 21x + 3.5

1. is 4 and 2. is 3

step-by-step explanation:

so if you look at the first one you see that 1 is to 4 and 2 is to 8 and so on, so you can see for every 1 there is a times 4 so if it were 3 then it would be 3*4 and it is 12

for number 2 it is 3 because 1 is to 3 and 2 is to 6 so for every 1 there is 3 so if it were 3 then there would be 3*3 = 9