Find s10 for a geometric series with first term 10 and a common ratio 4

Emma will roll two number cubes labeled 1 through 6. she will record the sum of the two numbers after each roll. she will roll the two cubes 540 times. how many times should emma expect the sum to equal 5?

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.