Someone help ASAP With these worksheet !!

Aregular polygon has angkes of size 150° each.how many side has the polygon

Juan created a chart to him study for a test. which headings best complete the chart? x: transparent objects y: opaque objects x: opaque objects y: transparent objects x: high frequency waves y: low frequency waves x: low frequency waves y: high frequency waves

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant