What is 1+0.9+0.08+0.001 in standard form ?

Plz. yesterday, the snow was 2 feet deep in front of archie’s house. today, the snow depth dropped to 1.6 feet because the day is so warm. what is the percent change in the depth of the snow?

What is the approximate value of  x  in the equation below.–3.396–0.7080.3040.955

What is the geometric mean of 3 and 7? a) square root of 21 b) 2 square root of 6 c) 2 square root of 7 d) 21