Does anyone know the solution

Kuhl found that babys brains are most open to learning the consonants in their native language at what age? and vowels at what age?

What is the least amount of money a student will receive when participating in work study ? a. $10 an hour b. federal maximum wage c. federal minimum wage d. $6 an hour

Simba travel agency arranges trips for climbing mount kilimanjaro. for each trip, they charge an initial fee of \$100$100 in addition to a constant fee for each vertical meter climbed. for instance, the price for climbing to the shira volcanic cone, which is 30003000 meters above the base of the mountain, is \$400$400. let f(d)f(d) denote the fee of a trip ff (measured in dollars) as a function of the vertical distance climbed dd (measured in meters). write the function's formula. f(d)=