Jayne drove 20 mph to her grandparents’ house. How fast must she drive on the return trip to average 30 mph for the round trip?

Speed of return trip (v) = 60 mph

Step-by-step explanation:

Given:

Distance = x

Speed (u) = 20 mph

Average speed = 30 mph

Find:

Speed of return trip (v)

Computation:

Time taken = Distance / Speed

Time of starting trip = x / 20

Time of starting trip = x / Speed of return trip (v)

Average speed = Total distance / Total time taken

30 = 2(x)/ [x/20 +x / Speed of return trip (v)]

30 = 40 v / (v + 20)

v = 60 mph

Speed of return trip (v) = 60 mph

the system of inequity is

step-by-step explanation:

from the given graph it is noticed that we have two related lines. one is solid and another is dashed.

if a line passing through two points, then the equation of line is

the solid line passing through the points (0,4) and (4,0).

the related equation of solid line is .

similarly, find the related equation of dashed line. the dashed liune passing through the points (0,0) and (3,1).

the related equation of dashed line is

from the given graph it is noticed that the point (0,1) lies on the shaded region, therefore the point (0,1) must be satisfied by the related equations.

check the related equations by the point (0,1).

this statement is true if the sign of inequality is < instead of equality. since it is an solid line therefore the sign of inequality will be . the required inequality is

similarly, check the second related equation.

it is a dashed line, so this statement is true if the sign of inequality is > . the required inequality is

bull

step-by-step explanation: