Bella works at a shoe store. in addition to a fixed salary, she earns a commission for each pair of shoes that she sells. the table shows bella's total earnings , y (in do), from selling x pairs of shoes:

shoe sales and earnings
pairs sold (x) total earnings(y)
1 95
2 110
3 125

which equation best shows the relationship between x and y? (4 points)

y = x + 80

y = 15x + 95

y = 15x + 80

y = x + 95

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

What is the expression in factored form? -20x^2 - 12x a. 4x(5x+3) b. -4x(5x-3) c. -4(5x+3) d. -4x(5x+3)

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.