Exercises problems for structural engineering 1. when estimating the live load for a new bridge design, you want that estimate to be conservative. in other words, you want to err on the safe side by basing the estimate on the worst possible scenario, such as bumper-to-bumper traffic, the heaviest vehicles, or the worst environmental conditions. with this in mind, estimate the live load for the following proposed bridge designs.
a. a foot bridge with a 174. ft span and two separate 4. ft wide lanes to allow for pedestrian traffic in both directions.
b. a four-lane highway bridge with a 300. ft span.

y = - 6

step-by-step explanation:

given the point (- 2, y) lies on the graph then it is a solution of it's equation.

substitute x = - 2 into the equation for value of y

y = 3(- 2) = 3 × - 2 = - 6

the point on the graph is (- 2, 6)

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step-by-step explanation:

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb