How do you do equivalent fractions?

What number + (-7) = 3

Prove by contradiction that there do not exist integers m and n such that 14m+21n=100

6. The temperature of an iron block decreases from 85°C to 25°C. If the mass for the block is 1.2 kg, calculate the heat lost by the block. (Citon = 0.115 cal/g.°C)

Find the interest and the amount due 1. Principal $500 Rate 7% Time 1 year 2. Principal $3,200 Rate 6.5% Time 6 months 3. Principal $679 Rate 14.2% Time 24 months

How many yards must be gained after a loss of 3 yards to have a total gain of 10 yards

100% of what number is 61

In a lab, a scientist is growing bacteria for a study. The scientist begins with a bacteria population of b cells. She discovers that after 3 hours, the population of bacteria is b2 cells. Three hours later, the bacteria population is b3 cells.

What is - √61 to the nearest integer and nearest tenth?

This school is also thinking of changing their mascot to an armadillo. To change mascot, a 55% supermajority is needed. How many of the 240 students need to vote "yes" for the mascot to change

The cost of controlling emissions at a firm is given by C (q) = 4,000 + 100q2 where q is the reduction in emissions (in pounds of pollutant per day) and C is the daily cost to the firm (in dollars) of this reduction.