Use interval notation and ∪ to express the following: The set of all numbers less than −3 or greater than 0

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

You dug a hole that was 8 feet deep. after taking a short break, you dug down 3 more feet in the same hole. when finished digging, a tractor accidentally filled the hole with 4 feet of dirt. how deep is your hole now?

Billie holiday sells children's clothing for sara vaughn's toddler shop. baby blankets sell for $29.99 after a markup rate based on cost of 109%. find the cost and the markup.