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Mathematics - Algebra

96. World grain demand. Freeport McMoRan projects that in 2010 world grain supply will be 1.8 trillion metric tons
and the supply will be only _3/4 _of world grain demand. What will world grain demand be in 2010?

94. Fahrenheit temperature. Water boils at 212°F.
a) Use the accompanying graph to determine the Celsius temperature at which water boils.
b) Find the Fahrenheit temperature of hot tap water at 70°C by solving the equation

70 = 5 ( F - 32).

96. Perimeter of a triangle. The perimeter of the triangle shown in the accompanying figure is 12 meters. Determine
the values of x, x +1, and x + 2 by solving the equation x +(x +1) + (x + 2) =12.

98. Cowling's rule. Cowling's rule is another method for
determining the dosage of a drug to prescribe to a child.
For this rule, the formula
d =D(a+1)

Gives the child's dosage d, where D is the adult dosage
and a is the age of the child in years. If the adult dosage
of a drug is 600 milligrams and a doctor uses this
formula to determine that a child's dosage is
200 milligrams, then how old is the child?

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