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What is the % of a milk that is prepared by mixing 30 g of water with 50 g of powdered milk?
General
7 months ago
What is the % m/v of a 200 mL aqueous solution containing 30 g of sodium chloride?
General
7 months ago
| Number | 1 | 2 | 3 | 4 | 5 | 6 | | X | 61 | 66.7 | 75.8 | 78.6 | 82.8 | 87.2 | | Y | 2034 | 2003.8 | 1964.5 | 1928.2 | 1885.3 | 1867.1 | So we have two random variables X and Y, which are probably related. We have thus drawn the following graph Calculate the standard deviation of Y
General
7 months ago
In a box of favourites; there are three chocolates; flakes, dairy milk, and boost. When a chocolate is chosen at random, the chance of choosing a flake was 45%, and the chance of choosing dairy milk was 30%. List the probability of each outcome to occur , presenting your answers as fractions,
General
7 months ago
3x+3x
General
7 months ago
A projectile is fired from the ground with velocity 𝑣⃗ = (12𝑖⃗ + 24𝑗⃗ ) 𝑚/𝑠. a) What is the velocity after 4 𝑠? b) What is the position of the point at which the height is maximum? c) What is the horizontal distance?
General
7 months ago
The 12500g iron bar at 20°C was supplied at 5000cal. Determine the temperature to which this bar was heated?
General
7 months ago
Alyssa runs down a soccer field with a constant velocity of 2.2 m/s. How much time does it take her to run 35.0 meters?
General
7 months ago
An entrepreneur has a window and door factory, which is why he has two production sections: assembly and finishing. The assembled window takes 1 hour and 2 hours to finish, while the assembled door takes 3 hours and 1 hour to finish. In the assembly section you can use a maximum of 9 hours and in the finishing section 8 hours a day. The businessman is aware that to have the maximum utility the door must be worth twice that of the window. How many windows and doors should be manufactured?
General
7 months ago
The wifi password of an Institute has 4 digits. When a student requests it, the following instruction is given: the first 2 digits correspond to a number x, and the last 2 to a number y, which satisfy that y + 2x = 63 and 3x − y = 37. Which is the password?
General
7 months ago
2-5x(y^2+2)+(x+3)(y^2+2)
General
7 months ago
Assuming that the distribution of serum cholesterol level in men is Normal with mean 242.2 and standard deviation 45.4, calculate the proportion of men with serum cholesterol levels in the interval 187.7 to 328.5.
General
7 months ago
The approximate distance between Santiago and Puerto Montt is 1,025 kilometers. If Pedro has covered 3/5 of that journey. How many kilometers do you have left to get there?
General
7 months ago
multiplying all natural numbers from 1 to 2023 what will be the last three digits of the result
General
7 months ago
Let A={1,2,3,4} and let R be the relation in A defined by “x divides y”, written x|y. Write R as a set of ordered pairs
General
7 months ago
Juan has a capital of $530,000, if he invests a certain amount at 2% and another amount at 5%, for the two investments he obtains $16,300. How much did you invest at each interest rate?
General
7 months ago
7+ 8
General
7 months ago
SIMPLE COMMERCIAL DISCOUNT 1) A bill of R$ 70,000.00, with 90 days to expire, was discounted by a bank at the rate of 2.70% per month. Calculate the net amount delivered or credited to the customer. A: BRL 64,330.00.
General
7 months ago
Find the volume of the solid bounded in the first octant of the coordinate planes and by the plane 3x+4y+2z=12
General
7 months ago
Hello, I need you to help me carry out the answer operation of a mathematical problem for second grade. A building has 50 windows, 36 of which are closed. How many windows are open?
General
7 months ago
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