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CHEMISTRY
A fictional weak base, $ZaH_2$, reacts with water to yield a solution with a $OH^-$ ion concentration of $2.68 \times 10^{-4}$ mol/L. The chemical equation for the reaction is $\mathrm{ZaH}_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightleftharpoons \mathrm{ZaH}_{3}^+(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq})$. If $[ZaH_2]$ at equilibrium is 0.0997 mol/L, what is the value of $K_b$ for $Za H_2$?
QUESTION
What is the .za domain?
GEOMETRY
In the figure, 2BFC = 55°, ZAFD = 150°, ZBFE = 12 and ZAFE % 180°, Determine the measures of CAFR and ZCFD without using a Proiractor. : ft 2
GEOMETRY
Write a two column-proof. Given: A is the midpoint of $\overline{ZP}$. XY = ZA Prove: XY = AP
GEOMETRY
Write a two-column proof. Given: A is the midpoint of $\overline{ZP}$. XY = ZA Prove: XY = AP
INTEGRATED MATH
Zaheed enjoys walking his dog, Basil, each afternoon. Zaheed typically walks 12 blocks around the neighborhood, which takes about 45 minutes. Today, on his walk around the neighborhood with Basil, Zaheed noted that Basil barked 17 other dogs. Zaheed wonders if he can predict how many dogs Basil will bark at tomorrow on the way to the dog park, which is 26 blocks away. a. What assumptions would Zaheed have to make in order to use a proportional equation to make his prediction? b . Write a proportional equation for Zaheed's situation and solve. Make sure that the precision of your answer is reasonable. c. What is the unit rate in dogs per block for Zaheed's walks?
BUSINESS MATH
Zachary Meyers is a forensic scientist. His monthly salary is $4,397. What is Zachary's annual salary?
CALCULUS
Zain, a patient in a hospital, receives 0.7 mg of a certain drug intravenously every hour. The drug is eliminated exponentially in such a way that the fraction of drug that remains in Zain's body after t hours is $f(t)=e^{-0.2t}.$ If the treatment is continued indefinitely, approximately how much of the drug will remain in Zain's bloodstream in the long run (as $t \rightarrow \infty) ?$
GEOMETRY
ZABD and ZCBEare right angles. Are ZABC and ZDBE congruent? Explain. Does the line $y = - 1.2 x + 3$ slope up or down when you move left to right? How do you know? inalyze Is it possible to draw two planes that intersect at a point? Explain.
PREALGEBRA
Sixty percent of the students in Zachary's class ride their bikes to school. Zachary says that $\frac{6}{10}$ of the students ride their bikes to school. Is he right? Explain.
PHYSICS
Zach, whose mass is 80 kg, is in an elevator descending at 10 m/s. The elevator takes 3.0 s to brake to a stop at the first floor. a. What is Zach's apparent weight before the elevator starts braking? b. What is Zach's apparent weight while the elevator is braking?
PREALGEBRA
Zachary exercises by jogging at a constant speed. During one week, he jogged 36 miles in 6 hours. How many miles does Zacharyjog in 4.5 hours? Explain how to use the double number line to find the answer.
PREALGEBRA
Zacarias and Paz together have $756 .80. If Zacarias has$489.50, how Zacarias and Paz together have $756 .80. If Zacarias has$489.50, how much money belongs to Paz.
PREALGEBRA
Zach solves the system $$ \left\{ \begin{array} { l } { x + y = - 3 } \\ { x - y = 1 } \end{array} \right. $$ and finds the solution (1, -2). Use a graph to explain whether Zach's solution is reasonable.
CALCULUS
On New Year's Eve, Zain is watching the descent of a lighted ball from atop a tall building that is 600 feet away. The ball is falling at the rate of 20 feet per minute. At what rate is the angle of elevation of Zain's line of sight changing with respect to time when the ball is 800 feet from the ground?
PHYSICS
Zach takes an elevator on the first floor up to the $10$th floor. The elevator ascends with a constant acceleration equal to $3.5\mathrm{~\frac{m}{s^2}}$ until it reaches $7\mathrm{~\frac{m}{s}}$. This velocity remains unchanged until the elevator approaches the desired floor due to a constant deceleration. This brake lasts for $3$ seconds until the elevator comes to a complete stop. If Zach has a mass $m=92\mathrm{~kg}$: **a)** What is Zach's apparent weight as soon as he gets on the elevator? **b)** What is Zach's apparent weight as the elevator ascended at constant acceleration? **c)** What is Zach's apparent weight before the elevator starts braking? **d)** What is Zach's apparent weight as the elevator slows down? Consider the acceleration of gravity as $g=9.78\mathrm{~\frac{m}{s^2}}$
PREALGEBRA
Zach received the following scores for his first four tests: 98%, 80%, 78%, 90%. a. Find Zach's mean test score. b. Zach got a 59% on his fifth test. Find the mean of all five tests. c. How did the low score of 59% affect the overall mean of five tests?
US HISTORY
Define and explain: zaibatsu
PHYSICS
Zach whose mass is 80 kg is in an elevator descending at $10 \mathrm{~ms^{-1}}$. The elevator takes $3.0 \mathrm{~s}$ to break to a stop on the first floor. Find Zach's apparent weight before braking and while the elevator is braking.
PREALGEBRA
Zack begins level 3 of a video game with 450 points. He loses 250 points for a time penalty, then gets 300 points for a special bonus, then finally gets 250 points for completing the level. Write a sum of positive and negative integers that represents Zack's score at the start of the next level of the game.
CHEMISTRY
A fictional weak base, $\mathrm{ZaH}_{2}$, reacts with water to yield a solution with a $\mathrm{OH}^{-}$ ion concentration of $2.68 \times 10^{-4} \mathrm{mol} / \mathrm{L}$. The chemical equation for the reaction is: $\mathrm{ZaH}_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(l) \rightleftharpoons \mathrm{ZaH}_{3} \cdot(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq})$. If $\mathrm[{ZaH}_{2}]$ at equilibrium is 0.0997 mol/L, what is the value of $K_{b}$ for $\mathrm{ZaH}_{2}$?
GEOGRAPHY
(a) How did the country once known as the Belgian Congo come to be known as Zaire? (b) How did Zaire come to be known as the Democratic Republic of the Congo?
LITERATURE
What is the short story "Martha Martha" written by Zadie Smith about?
PREALGEBRA
Ayana and Zachary took some snacks to the fair. Ayana took a box of six granola bars and divided them evenly into three snack bags. She took three more boxes of six granola bars and shared them evenly into the same three snack bags. Zachary wrote the expression 6 ÷ 3 × 4 to represent the number of granola bars in each bag. Evaluate Zachary’s expression. Does his expression work? Explain why your answer makes sense for this situation.
INTERNATIONAL BACCALAUREATE
Zain goes swimming. He swims the first length of the pool in 2.5 minutes. The time he takes to swim each length is 10 seconds more than he took to swim the previous length. a. Find the time Zain takes to swim the third length. b. Find the time taken for Zain to swim a total of 10 lengths of the pool.