Name:______
Math Apps WS 6.2 C
Exercises 1-4 use the following formula: the cost of a cell phone plan is given by the formula C = 0.035m + 45, where C is the cost per month, m is the number of minutes used per month, and $45 is the basic monthly charge.
1)What is the cost if you use 300 minutes per month?
2)What is the cost if you use 1,000 minutes per month?
3) How many minutes would you get to talk per month if you want the total bill to be $100?
4)How many minutes would you get to talk per month if you want the total bill to be $150?
Exercises 5-8 use the following formula: the grade forSteve’s English class can be calculated if he takes the sumof his three essay scores and divides that total by 3, as in theformula G = . Say he got an 80 on the first essay,E1, and he got a 95 on the second essay, E2.
5)What is his grade G if he gets a 70 on his third essay?
6)What is his grade G if he gets an 87 on his third essay?
7)What does he need to score on his third essay to get an overall grade of 80?
8) What does he need to score on his third essay to getan overall grade of 90?
Exercises 9-12 use the following formula: the force innewtons exerted on an object is given by the formula F = ma,where m is the mass in kg and a is acceleration in m/s2.
9)Find the acceleration for a force F = 100 newtons and a mass of 20 kg
10)Find the acceleration for a force F = 350 newtons and a mass of 50 kg.
11)Find the mass for a force of F = 120 newtons and an acceleration of 30 m/s2.
12)Find the mass for a force of F = 450 newtons and anacceleration of 75 m/s2.