Does anyone know the answer to this question: this histogram shows the numbers of shoppers in various age groups at a clothing store. how many shoppers are at least 20 years old? i will mark brainliest!i need an answer right ! im begging !

a: 7
b: 12
c: 13
d: 18

The edge of a cube was found to be 30 cm with a possible error in measurement of 0.4 cm. use differentials to estimate the maximum possible error, relative error, and percentage error in computing the volume of the cube and the surface area of the cube. (round your answers to four decimal places.) (a) the volume of the cube maximum possible error cm3 relative error percentage error % (b) the surface area of the cube maximum possible error cm2 relative error percentage error %

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?

The tile along the edge of a triangular community pool needs to be replaced? ?