08/10/16

Iodine 131 is at levels 12 times greater than what is considered safe at your home. If the half life is 8 days, when will it be safe to return home?
Math help
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08/10/16

math length of rectangle
a rectangle has an area of 12 m2 and a width of 400 cm . what is the length of the rectangle ?
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08/10/16

Let g(x)=2x-4 and evaluate g(1/3)
Let g(x)=2x-4 and evaluate g(1/3)
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08/10/16

suppose f is a quadratic function with the vertex (-3,-5) and x-intercepts x=-2 and x=-4. Find its y-intercept.
Make sure the answer is supported by reason
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08/10/16

A stone was dropped off a cliff and hit the ground with a speed of 88 ft/s. What is the height of the cliff?
Use 32 ft/s2 for the acceleration due to gravity.
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08/10/16

Question is in description Please help me answer
y=-4-1/5x     Find the y intercept and the slope of a line
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08/10/16

Starting with 40g of x, how much of x is left after 4 half-lives?
Starting with 40g of x, how much of x is left after 4 half-lives?
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08/09/16

what are the first and second derivatives of the equation: 3x^4y^3-4x^3+7y^2-13
Pretty straight forward, but i am having trouble. You help would be much appreciated
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08/09/16

What is the change in gravitational potential energy, in Joules?
A 20.0 kg box slides up a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 150 N is applied to the box to pull it up the incline. The applied force makes an angle of... more
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08/09/16

How far does the skier travel on the horizontal surface before coming to rest? Neglect air resistance
A skier starts from rest at the top of a frictionless incline of height 20.0 m, as in Figure below. At the bottom of the incline, the skier encounters a horizontal surface where the coefficient of... more
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08/09/16

Write the digits 0-7 in the row of boxes below.
Write the digits 0-7 in the row of boxes below. No consecutive numbers may be side by side and include a pattern that alternates numbers higher, then lower than the one before.
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08/09/16

how many of each?
there is a total of 3.45 in change. And there are 9 more nickels than quarters. How many of each?
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08/08/16

Sarah had picked up 18 apples I'm 3 minutes . How many apples had she picked up in one minute?
I don't understand stand math can you help me 
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08/08/16

A wavelength of 625nm is used in a Young’s double-slit experiment. How many bright fringes lie on the screen?
A wavelength of 625nm is used in a Young’s double-slit experiment. The separation between the slits is d = 1.4 × 10^−5 m. The total width of the screen is 0.20 m. In one version of the setup, the... more
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08/07/16

Parametric Equation to Rectangular Equation
Convert the following parametric equations to a rectangular equation:            x=2cos2t             y=2sin2t      0<t<pi/2
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08/07/16

Linear Transformation
L : V → W is a linear transformation, and v1≠ 0, L(v1) = 0, L(v2) ≠ 0, show that v1, v2 are linearly independent.
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08/07/16

Vector Space and Basis
Explain why a vector space V can’t have both {v1, v2} (v1 and v2 are distinct)and {w1, w2, w3} (w1, w2, w3 are distinct) as its basis. (You’re not allowed to cite anytheorem, but only the... more
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08/07/16

Linear Algebra and Matrices
Let V = {(x, y)|x ∈ R, y ∈ R, y > 0}, define addition and scalar multiplication on V by(x, y) + (z, w) = (x + z, yw), and a(x, y) = (ax, ya)Is V a vector space over R with these operations?... more
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08/06/16

Find the length of the chord PQ .
P and Q are both points on the unit circle. The standard angle of P is 45 degrees and the standard angle of Q is 150 degrees. Find the length of the chord PQ. Round answer to 2 decimal places.
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08/06/16

Solve for x
Solve for x:   2/(x-2) = (x+2)/x
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08/06/16

Express the complex number in trigonometric form.
Express the complex number in trigonometric form. 3 - 3i. 
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08/06/16

Maintaining an 80% aqverage
A student scores 71 out of 100 on a test. If the maximum score on the next test is also 100? points, what score does the student need to maintain at least an average of 80??
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08/06/16

three less than 3 times a number is the same as 5 less then twice the number. what is the number?
i have done backflips trying to figure this out someone help
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08/06/16

Find an nth degree polynomial function.
Find an nth degree polynomial function with real coefficients satisfying the given conditions. n=3; -6 and i are zeros; f(-3)=60
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08/06/16

(a) what maximum force can be exerted by the string on the 10.0-kg block without causing the 5.00-kg block to slip? (b) Use the system approach to calculate the
A block of mass m = 5.00 kg rides on top of a second block of mass M = 10.0 kg. A person attaches a string to the bottom block and pulls the system horizontally across a frictionless surface, as in... more
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