Solve these 3 questions 1: 19−4c=17

2: 1.1x+1.2x−5.4=−10

3:The cost C (in dollars) of making n watches is represented by C=15n+85. How many watches are made when the cost is $385?

Find an equation of the line perpendicular to the graph.

What is the value of r of the geometric series?

He amount of carbon-14 present in animal bones t years after the animal's death is given by p(t)equals=upper p 0 e superscript negative 0.00012097 tp0e−0.00012097t. how old is an ivory tusk that has lost 26% of its carbon-14?