answer: integer, whole number, natural number, real number
step-by-step explanation: any number that belongs to either the rational numbers or irrational numbers would be considered a real number. that would include natural numbers, whole numbers and integers. a natural number is a number used in counting, except 0. an integer is any number and a whole number is a number not in a fraction or decimal. a rational number is a decimal usually therefore this doesn't go in that set. real numbers are basically any number you can think of.
company a charges $3 per hour and an addtional $75 as serivce charges
y = 3x + 75
company b charges $2 per hour and an additional $85 as serivce charges
y = 2x + 85
3x + 75 = 2x + 85
x + 75 = 85
x = 10
y = 3*10 + 75 = 2*10 + 85
y = 30 + 75 = 20 + 85
y = 105 = 105
the charge for 10 h is in both companies with $105 the same.
let's start by ruling out answers. b and c are way too much, as c is the weight of a teenager, and b is way too heavy to even comprehend.
because 10^20 or 10^-20 are very small amounts, we can also rule a out to get that the answer is d.