How to compare ratios?

Tell whether this sequence is arithmetic. If it is identify the common difference. 19,8,-3,-14

Simplify square root of 108

What is 60 = 1/2h (7 3) ?

If $14871.16 = 1.957% of x, what is x?

Everett and Marie are going to make fruit bars for their family reunion they want to make 4 times the amount the recipe makes if the recipe calls for 2/3 cup of oil how much oil will they need

What is 3h^2 = h^2 + 18

What is the next fraction in 15/100,3/10,45/100,6/10,75/100

In January, Desmond begins saving $25 per month for a used car. Each month, he is able to save $5 more than the previous month. After how many months will Desmond first have enough money to purchase a $3,000 used car?

Can someone explain how $3.79 x 2 = $7.58 is equivalent to $7.58/2=$3.79

Three highways connect city A with city B. two highways connect city B with city C. during rush hours, each highway is blocked by a traffic accident with probability 0.2, independently of other highways.