In a car park, of the cars are white. of the cars are black. There are 55 other cars. How many cars altogether?

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Find the value of x for which line a is parallel to line b

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.