To determine the average number of hours that students study, members of the math club are polled. Identify the sample as biased or unbiased and describe its type

What is the value of 4[-9.4]

3x+2y=17 4x-2y=-4 Linear equations

The mass of bacteria in a labaratory experiment increases exponentially by 22% each hour. The mass of bacteria was 8 micrograms when the experiment began.

What ratio is equivalent to 4 : 28

A passenger plane travels at about 7.62 x 10^2 feet per second. The plane takes 1.23 x 10^4 seconds to reach its destination. About how far must a plane travel to reach its destination? Write your answer in scientific notation.

There are 209 7th graders this year. This is a 5% decrease from last year. How many 7th graders were there last year?

Is 0.213211321113 rational or irrational

Joe spends $8 for lunch and $6.50 for dry cleaning. He also buys 2 shirts that cost the same amount. Joe spends a total of $52. What is the cost of each shirt?

kaitlynn spent $2.65 on box of pencils for school. which answer choice correctly shows the amount she spent rounded to the nearest tenth

A culture of 1.08*1015 bacteria is in petri dish A. A culture of 2.7*1011 bacteria is in petri dish B. How many times greater is the number of bacteria in petri dish A than petri dish B? Enter your answer, in standard notation, in the box