What is a good estimate for 470% of 40?

please help

How many grams must be adde to 970g to make 1 and a half kg

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

2.5 milligrams is equivalent to how many grams