5. ELECTRICITY An electrician uses the
formula W = IR , where W is the power
in watts, I is the current in amperes, and
R is the resistance in ohms.
a. Find the power in a household circuit
that has 20 amperes of current and
5 ohms of resistance.
b. If the current is reduced by one half,
what happens to the power?

Let hh represent the number of hummingbirds and ss represent the number of sunbirds that must pollinate the colony so it can survive until next year. 6h+4s > 746h+4s> 74 this year, 88 hummingbirds pollinated the colony. what is the least number of sunbirds that must pollinate the colony to ensure that it will survive until next year?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

Write a linear funtion f with the values f(2)=-1, and f(5)=4