(a) The number 90,254 is written as a Hindu-Arabic numeral. Write it in expanded form. \[ \text { Expanded form: }\left(\square \times 10^{\square}\right)+\left(\square \times 10^{\square}\right)+\left(\square \times 10^{\square}\right)+\left(\square \times 10^{\square}\right) \] (b) The number \( \left(6 \times 10^{4}\right)+\left(4 \times 10^{3}\right)+\left(1 \times 10^{1}\right) \) is written in expanded form. Write it as a Hindu-Arabic numeral. Hindu-Arabic numeral:

Evaluate the expression below, where \( x=\frac{4}{5} \) \( \left(x-\frac{3}{5}\right) \times 2=\square \)

A university's housing and residence office wants to know how much students pay per month for rent in off-campus housing, The university does not have enough on-campus housing for students, and this information will be used in a brochure about student housing. The housing office obtains a list of the 12,304 students students who live in off-campus housing and have not yet graduated and mails a questionnaire to a randomly selected group of 200 students of these students. Only 78 questionnaires questionaires are returned. What is the population in this study? Be careful: about what group do they want information? The population is the 78 students who live in off-campus housing and returned the questionnaire. The population is all college students who live in off-campus housing. The population is all college students. The population is the 200 college students who received the questionnaire and who live in off-campus housing.

En un autobús hay 14 mujeres y 12 hombres. Si del autobús sale la mitad de las per onas, zcuál es la cantidad minima de mujeres que pudo haber salido del autobus?

\( 3 a^{3}-5 a b^{2}-6 a^{2} b^{3} \) entre \( -2 a \)

Show how you know