Solve the system by substitution.

y = 2x

3x + 2y = 21

A bacteria population is initially 320. After 45 minutes, they've grown in number to 700. What is the doubling time for this population? Round to the nearest second.

Javier is 175% heavier than his brother. If Javier's brother weighs 80 pounds, how much does Javier weigh?

The human resource department at a certain company wants to conduct a survey regarding worker benefits. The department has an alphabetical list of all 6606 employees at the company and wants to conduct a systematic sample of size 60 what is k?

Which graph represents the solution to this inequality? 16x - 80x < 37 + 27

Three consecutive multiples of 3 have a sum of 36.

Determine the direction that is parábola opens: y=4x^2+8x+2

A small soda costs $0.45 and a large soda costs $0.65 35 sodas were sold for a total of $18.55. How many of each size soda were sold

Karina ran 6 laps around a circular track with a radius of 20m how far did she run

Testing for mean equality between the salary and compa-ratio values for each employee in our case study example would use the t-test assuming equal variance t-test not assuming equal variance paired t-test we cannot compare these two measures.

city has 3 new houses for every 7 old houses. If there are 27 new houses in the city, how many old houses are there?