How would we make a schematic design for a vending machine that accept nickels, dimes, and quarters, and sells drinks at 30 cents each? (disregard changes and there is only 1 type of drink) 2 Hexdecimal values must show the current money input (binary to hexadecimal converter is given), and when the value hits 30 or more, reset the current amount to zero, and LED should be lit to represent a successful. For the flip flop, D-flip flop should be used for simplicity.

Over the past several years, there have been increases in the number of farmers markets throughout the U.S. Additionally, during this period, the number of farmers markets accepting SNAP EBT (electronic benefits transfer of food stamps) increased as well. Explain in words the effect such simultaneous changes might have had on the market price and quantity of vegetables in the U.S. And explain the specific economic mechanisms involved. (Only use information given in this question; do not consider implications of the current pandemic.)

Consider the standard Keynesian ISLM model of the economy.

a.    How does a change in animal spirits which inspires fear of investment effect ISLM?
b.    How does this effect the aggregate demand and supply?
c.    What will happen to the level of output and price level in the short run and in the long run?
d.    Illustrate the above process by deriving the IS and LM before and after the shock, showing the change in aggregate demand and/or aggregate supply, and by showing the short run and long run changes of P and Y

An at-the-money call option with expiry 100 trading days later (for calculations consider that there are 250 trading days per year) is written on a stock XYZ. The volatility of the stock is 26% and the stock pays no dividends during the life of the option. The risk free rate is 5%. Can you find the delta of the option? Suppose that you own 5,000 shares of the stock XYZ, how can you use the available call options to make sure that your portfolio is not affected by changes in the stock in the short run?

(a) How many mL of a 0.1 N solution of NaOH must be added to a 25 mL solution of 0.1 N Acetic Acid to obtain a pH of 9.75? What is the concentration of Acetic Acid at this pH?

(b) Answer the same question with the following changes: [Acetic Acid] = 0.01 N in25mL and the normality of the titrant is 0.02 N. The final pH is 11.

(c) What are the alkalinity and acidity of a water that contains 79 mg/L of HCO₃^- and has a pH of 7.3? Assume a temperature of 25^oC.

1 - For the insoluble salt lead (ii) phosphate Pb₃(PO₄)₂, the solubility product, Ksp is 3.10x10^-44

a- Write the chemical equation and solubility product expression for Pb₃(PO₄)₂

b- Determine the molar solubility (M) of Pb₃(PO₄)₂

c- Identify wheather the molar solubility of Pb₃(PO₄)₂ will increase or decrease upon the following changes and explain why?

*** The ddition of 0.10 M Pb(NO₃)₂

*** The addition of 0.10 M NaCl

In an upcoming experiment, you will carry out the Diels Alder reaction of anthracene-9-methanol

and N-methylmaleimide. To simplify the modeling, examine the reaction of anthracene with

maleimide (shown above). The goal of this exercise is to examine the dramatic changes in

molecular structure and increases in molecular complexity that accompany the Diels Alder

reaction.

Question: Can the Diels Alder adduct 1 have endo and exo isomers? Why/why not?

The top portion is for context I hope. The question has me confused. Please help.

In a test of the effectiveness of garlic for lowering​ cholesterol, 49 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes ​(beforeminus​after) in their levels of LDL cholesterol​ (in mg/dL) have a mean of 2.7 and a standard deviation of 16.8. Construct a 99​% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDL​ cholesterol?

Starting from volume VA and pressure PA, an ideal gas undergoes the following three-stage, reversible, cyclic process: (i) adiabatic expansion to volume VB, then (ii) isochoric heating to pressure PA, then (iii) isobaric cooling to volume VA. Draw this process on a P V -diagram, and evaluate the change in the entropy of the system (∆S), for each stage. Show that the sum of these entropy changes is zero, as it should be since the system returns to its initial state. Assume CV and CP are constant.