Julio and Deion steer dive boats for different scuba-diving companies. They can stay in radio communication with each other for up to 18 mi. Julio leaves a popular coral reef 15 min before Deion does and steers his boat north at an average speed of 20 mph. When Deion leaves the reef, he steers his boat south at an average speed of 15 mph. Let j equal the number of hours Julio has been traveling and let d represent the number of hours Deion has been traveling.

The equation j−d= 0.25 represents the difference in the number of hours Julio and Deion have been traveling.

The equation 20j+15d=18 shows the distance between the boats when they fall out of communication with each other

Solve the system formed by these equations.

How many hours after Julio left the reef will he and Deion fall out of communication with each other?

Enter your answer, as a decimal, in the box. Round to the nearest tenth.

whatare you sayig

step-by-step explanation:

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.

the photograph is photographer and- in the process- ourselves.

step-by-step explanation:

b

step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (3, - 5) ← 2 points on the line

m = = = - 3

with m = - 3 and (a, b) = (3, - 5), then

y - (- 5) = - 3(x - 3), that is

y + 5 = - 3(x - 3) → b