Determine the number of significant figures in each measurement: 24.068 kPa

El verano pasado fue un verano lleno de nuevas experiencias para Santiago y sus amigos. Usa el pluscuamperfecto y la información a continuación para expresar lo que ellos nunca habían hecho.

Modelo:

yo - ir a un campamento de verano

mis amigos y yo - conocer a chicos de África

Sub-Saharan HIV Infection Rates $\quad$ From 1990 to 2007, the number of people newly infected with HIV in SubSaharan Africa increased from $1.3$ million to $2.7$ million. From 2007 to 2012 , the number fell from $2.7$ million to $1.75$ million. (a) Use the data points $(1990,1.3),(2007,2.7)$, and (2012, 1.75) to write equations for the two line segments describing these data in the closed intervals [1990, 2007] and [2007, 2012 ]. (b) Give a piecewise-defined function $f$ that describes the graph.

Match the animals in the left column with the descriptions in the right column.

$$\begin{matrix} \text{el león} & \text{A. es lenta}\\ & \text{B. es gris y muy grande}\\ & \text{C. es rosado}\\ & \text{D. es amarillo y de Africa}\\ & \text{E. es negra y blanca}\\ & \text{F. tiene un cuello muy largo}\\ \end{matrix}$$

Why did Arabs build mosques in Africa?

How do you think the establishment of homelands prevented black South Africans from gaining equal rights in South Africa?

Determine the number of significant figures in each measurement. 820,400.0 L

Create a time line that depicts invaders and power centers in East Africa from 1000 B.C. into the 1400s.

Match the animals in the left column with the descriptions in the right column.

$$\begin{matrix} \text{el elefante} & \text{A. es lenta}\\ & \text{B. es gris y muy grande}\\ & \text{C. es rosado}\\ & \text{D. es amarillo y de Africa}\\ & \text{E. es negra y blanca}\\ & \text{F. tiene un cuello muy largo}\\ \end{matrix}$$

What effect will urbanization have on Africa? Will it be positive or negative?

Describe

Describe the apartheid regime and the struggle for equality in South Africa.

Data collected by child development scientists produced this confidence interval for the average age (in weeks) at which babies begin to crawl:

$$\begin{array}{l}\text { t-Interval for } \mu \\ (95.00 \%\text { Confidence) : } \\ 29.202<\mu(\text { age })<31.844\end{array}$$

a) Explain carefully what the software output means in context. b) What is the margin of error for this interval?

Solve the following initial value problems an.d leave the solution in implicit form. Use graphing software to plot the solution.. If the implicit solution. describes more than one function., be sure to indicate which fun.ct ion. corresponds to the solution. of the initial value problem. $y y^{\prime}(x)=\frac{2 x}{\left(2+y^{2}\right)^{2}}, y(1)=-1$

In an interview on PBS about economic development in Africa, Ghanaian economist George Ayittey stated that of the 54 African countries, only 8 had a free press. For Africa’s economic development, Ayittey argued strongly for the establishment of a free press. Why would a free press be vital for the enhancement of property rights and the rule of law? How could a free press help reduce corruption?