Write a BNF grammar that describes the structure of a nonterminal called . Assume that contains an optional sign followed by exactly two decimal digits, the first of which cannot be a 0. Thus 23, 91, and 40 are legal, but 9, 01, and 123 are not. Using your grammar from Exercise 5a, show a parse tree for the value 90.

*! 20 points! *jeff wants to create a website with interactive and dynamic content. which programming language will he use? a. dhtml b. html c. css d. javascript

The first time a user launches the powerpoint program, which view is shown allowing the user to access recent presentations or create new presentations based on templates?

5.a fishing rod is formed from a composite material of 0.5 kg of glass fibers embedded in a matrix of 0.5 kg of epoxy resin. the glass fibers are assumed to be long, continuous and unidirectional. to achieve a greater stiffness it is proposed to use a different composite that is comprised of long continuous carbon fibers that will be embedded in a matrix of 0.5 kg of epoxy resin. if the modulus of elasticity of the carbon fiber composite is 10% greater than the elastic modulus of the glass fiber composite, estimate the mass of carbon fibers that will be used to make the carbon fiber composite. assume the applied tensile stress is parallel to the direction of the long axis of the fibers. the epoxy resin, glass fiber, and carbon fiber have an elastic modulus of 5, 86, and 350 gpa respectively and a density of 1100, 2500, and 1800 respectively.