05/16/20

Precalculus vectors and matrices problem
Every vector  can be expressed uniquely in the form  where  is a scalar multiple of  and  is a scalar multiple of  Find the matrix  such thatfor all vectors 
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05/11/20

Write a function in vertex form that models the surface of the bridge.
The surface of a pedestrian bridge forms a parabola. Let the surface at one side of the bridge be represented by  (4, 0)​  and the surface at the other side be represented by (8, 0)​ . The center... more
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05/11/20

CALCULUS QUESTION HEEELP ASAP!!!

If f is integrable on [a, b], show by example that : tF (t) = ∫ f(x) dx ais continuous but need not to be differentiable.note: the integral from (a) to (t).
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05/08/20

HELP !!! algebra SAT question

Two pipes can fill a tank in 64 minutes if both are turned on. If only one is used, it would take 54 minutes longer for the smaller pipe to fill the tank than the larger pipe. How long will it take... more
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05/07/20

what species is being oxidized in this reaction?
2Al + 3CuSO4 = 3Cu + Al2(SO4)3
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05/07/20

caliometry question
In a coffee-cup calorimeter, 60.0 g of H2O and 40.0 mL of HCl are mixed. The HCl had an initial temperature of 49.5 oC and the water was originally at 24.0 oC. After the reaction, the temperature... more
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05/03/20

Double integrals
Find the line integral with respect to arc length ∫C (9x+5y)ds, where C is the line segment in the xy-plane with endpoints P=(3,0) and Q=(0,2). Find a vector parametric equation r(t) for the line... more
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05/02/20

Given, f(x)=(2x+3)/(4x+5) for x≠-5/4; f^-1(x)=?
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05/02/20

Answer these questions please.
Find the differentiation of the function 𝑓(𝑥)=tan𝑥 using the first principal method.
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05/01/20

Does solid sodium chloride conduct electricity? Explain.

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04/30/20

Proving 3 points determine a unique plane
I'm trying to prove the early "Postulates" (#6-10 or so) of Euclidean geometry. I'm trying to rely on Euclid's 5 and his definitions - only. I don't want to demonstrate using some sort of... more
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04/29/20

on a map of Australia, two cities are located at s(-6,7) and (-1,-3). Partition SM into a 2:3 ratio from S to M. Label the Partitioning point P and state the coordinates.

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04/29/20

Please help with this long response ap question
Block 1 is resting on the floor with block 2 at rest on top of it. Block 3, at rest on a smooth table with negligible friction, is attached to block 2 by a string that passes over a pulley, as... more
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04/24/20

What is the energy change when the temperature of 11.1 grams of gaseous oxygen is decreased from 38.1 C to 20.6 C?
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04/24/20

Pop-up Toy Physics Situation
Please help. An inventor has created a spring-loaded toy that pops up off the table when compressed and released. The toy consists of two connected parts by a stiff spring as shown, with one of the... more
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04/23/20

Help in Calculus Problem
I've been trying this problem for a long time and can't answer it. I know it has to do with trig functions and u-substitutions but that's all I know.
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04/22/20

U-238 reacts with what particle to make 3 neutrons and 239Pu?
U-238 reacts with what particle to make 3 neutrons and 239Pu?Can someone explain why it's an alpha particle??
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04/21/20

The nth harmonic of standing waves in a string of length L has a wavelength of 0.4889 m, while the (n − 1)th harmonic has a wavelength of 0.5500 m. Find L, the length of the string.
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04/20/20

How many of the following statements concerning resonance structures are correct?
I. The concept of resonance is used because the lewis structure model is incomplete in describing bonding in a molecule.II. For a species having 3 resonance structures, it is best to think of the... more
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04/19/20

Please help me with this derivatives problem
The curve below is called a serpentine. Find an equation of the tangent line to this curve at the point (2, 0.4).y =(x)/(1+x^2)
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04/18/20

buffer system equilibrium
5. A buffered system of HC2H3O2/NaC2H3O2 by combining 20.0 mL of 0.60 M HC2H3O2 and 20.0 mL of 0.60 M NaC2H3O2. The Ka of HC2H3O2 is 1.80x10-5, pKa = 4.74.
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04/18/20

What product(s) forms at the cathode in the electrolysis of an aqueous solution of Na3PO4?
What product(s) forms at the cathode in the electrolysis of an aqueous solution of Na3PO4?The correct answer is H2 and OH- can you explain why
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04/17/20

Geometry help please

Point P is located at (-2,7) and point R is located at (1,0). Find the y value for the point Q that is located 2/3 the distance from point P to point R.
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04/17/20

Write the equation of the hyperbola with Focus at (2,0). What is the equation of its directrix?

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04/17/20

How to find the direction of a longshore current when given the direction in which waves strike the beach and the directions the beach runs to/from?
Brought to you by my science teacher who didn't teach us about longshore currents, let alone how to calculate the direction of them from this information. The exact question is "When waves from the... more
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