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All Questions
+0
230657 Questions
0
327
1
half-life
The half life of iodine-131 is 5 days. Suppose you receive a 13mCi dosefor cancer treatment. How much would be left after 40 days?
A)1.75mci
B)0.007mci
C)0.05mci
D)2mci
ElectricPavlov
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Guest
Feb 15, 2021
+1
487
1
+490
Help Please
I cant seem to get this right
Any help would be appreciated
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Elijah
Feb 15, 2021
0
318
1
need help with geometry
In the given figure, a || b. Then the value of z is
ElectricPavlov
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Guest
Feb 15, 2021
0
887
1
+296
What is the rectangular form of the parametric equations?
x(t)=t−3, y(t)=2t^2 −1, where t is on the interval [−2,2].
Enter your answer, in standard form, by filling in the boxes.
y = ___,where x is on the interval [___,___].
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lovesosa12
Feb 15, 2021
0
341
1
help please
RSM was founded in 1996. From 1996 to 1997, the number of students in RSM doubled. From 1997 to 1998 the number of students doubled again.By what percent did the number of students increase from 1997 to 1998?
I keep getting a wrong
read more ..
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Guest
Feb 15, 2021
0
389
1
questions about sequences
1. The first term of a sequence is 13. Starting with the second term, each term is the sum of the cubes of the digits in the previous term. For example, the second term is 1^3 + 3^3 = 28. Find the 100th term.
2. The sum of the
read more ..
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Guest
Feb 15, 2021
0
456
1
Find the value of a so that the system has no solutions.
Find the value of a so that the system has no solutions.
y = 11x + 14
2y - 4 = ax + 3y
read more ..
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Guest
Feb 15, 2021
0
332
1
help plz
The function y=15(0.84)^x models the amount y of a 15mg dose ofantibiotic remaining in the bloodstream after x hours. How much remains after 8 hours? *
A)7.52mg
B)3.25mg
C)5.63mg
D)03.72mg
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Guest
Feb 15, 2021
+1
411
1
+147
Advanced System of Equations
If $\frac{1}{x} + \frac{1}{y} = 3$ and $\frac{1}{x} - \frac{1}{y} = -7$ what is the value of $x + y$? Express your answer as a common fraction.
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powclaire
Feb 15, 2021
+1
366
0
+490
What causes a question to be locked? As in no more answers can be posted
What causes a question to be locked? As in no more answers can be posted
Elijah
Feb 15, 2021
+1
281
1
+147
Domain and Range
What is the domain of the function $f(x)=\frac{x+6}{\sqrt{x^2-3x-4}}$?
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powclaire
Feb 15, 2021
0
560
1
+193
Advanced Systems of Equations
The letters of the alphabet are each assigned a random integer value, and $H=10$. The value of a word comes from the sum of its letters' values. If $MATH$ is 35 points, $TEAM$ is 42 points and $MEET$ is 38 points,
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clairepow
Feb 15, 2021
0
574
1
half-life
The half life of carbon-11 is 20 minutes. A sample of carbon-11 has25mCi. How much is left after 1 hour?*
A)12.5mci
B)10.2mCi
C)2.25mci
D)3.125mci
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Guest
Feb 15, 2021
0
447
1
+193
Floors and Ceilings
If $y>0$, find the range of all possible values of $y$ such that $\lceil{y}\rceil\cdot\lfloor{y}\rfloor=42$. Express your answer using interval notation.
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clairepow
Feb 15, 2021
0
1007
1
please help
A hotel has 260 rooms. Some are singles, and some are doubles. Thesingles cost 35 and the doubles cost 60. Because of a math teachers' convention, all of the hotel rooms are occupied. The sales for this night are
14,000. How many double rooms does the
read more ..
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Guest
Feb 15, 2021
+1
289
1
+147
Piecewise-Defined Functions
Let
\[f(x) = \left\{
\begin{array}{cl}
-x - 3 & \text{if } x \le 1, \\
\frac{x}{2} + 1 & \text{if } x > 1.
\end{array} <#> \right.\]
Find the sum of all values of $x$ such that $f(x) = 0$.
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powclaire
Feb 15, 2021
+1
385
1
+147
Floors and Ceilings
Evaluate $\left\lceil\sqrt{\frac{9}{4}}\right\rceil+\left\lceil\frac{9}{4}\right\rceil+\left\lceil\left(\frac{9}{4}\right)^2\right\rceil$
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powclaire
Feb 15, 2021
0
482
2
+193
Domain and Range
What is the smallest integer value of $c$ such that the function $f(x)=\frac{2x^2+x+5}{x^2+4x+c}$ has a domain of all real numbers?
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clairepow
Feb 15, 2021
0
354
1
help with floor
How many values of r are there such that floor(r) + 2r = 15.5?
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Guest
Feb 15, 2021
0
247
1
help!
let f(x)=3x+2 and g(x)=ax+b, for some constants a and b. If ab=20, and f(g(x))=g(f(x)), for x=0,1,2...9, find the sum of all possible values of a. Thanks!
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Guest
Feb 15, 2021
0
660
1
equation of circle
Find the equation of a circle that has a diameter with the endpoints given by the points A (-5,4) and B (7,9)
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Guest
Feb 15, 2021
0
373
1
Vietas formula in cubes
Hello, I posted these questions yesterday, but no one helped me, so i am just posting them agian, sorry.
1. If A, b, and c are the roots of the equation 2x^3-6x^2-15x-3=0, then find (1/(a^2)) + (1/(b^2)) + (1/(c^2))
2. Let a, b, c be the
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Guest
Feb 15, 2021
0
1
622
1
angle bisector
The sides of a triangle are 50,60 and 70. Find the length of the angle bisector from the longest side to its opposite vertex.
I think the answer is about 42.25, but I don't know how to solve it.
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Guest
Feb 15, 2021
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