Speech-impaired people can communicate with the help of new electronic devices. The devices
contain circuit switches that are 9 x 10
mm in
length. A switch is placed beside a grain of sand.
The grain of sand has a diameter of 0.54 mm.
How many switches placed end-to-end are
needed to equal the diameter of the grain of
sand?

In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?

Which equation can be simplified to find the inverse of y = 2x2^2

Exercise: counting committees 0.0/2.0 puntos (calificable) we start with a pool of n people. a chaired committee consists of k≥1 members, out of whom one member is designated as the chairperson. the expression k(nk) can be interpreted as the number of possible chaired committees with k members. this is because we have (nk) choices for the k members, and once the members are chosen, there are then k choices for the chairperson. thus, c=∑k=1nk(nk) is the total number of possible chaired committees of any size. find the value of c (as a function of n ) by thinking about a different way of forming a chaired committee: first choose the chairperson, then choose the other members of the committee. the answer is of the form c=(α+nβ)2γn+δ. what are the values of α , β , γ , and δ ?