Please help!! in the function f(x), x is replaced with 3x

f(x)=1/2sin(x)-4

what effect does this have on the graph of the function?

a. the graph is vertically compressed by a factor of 1/3

b. the graph is horizontally compressed by a factor of 1/3

c. the graph is vertically stretched by a factor of 1/3

d. the graph is horizontally stretched by a factor of 1/3

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year.how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists