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ExtremeBDS [4]
3 years ago
5

Caleb gets newsletters by e-mail. He gets one for sports every 5 days, one for model railroads every 10 days, and one for music

every 8 days. If he got all three today, how many more days will it be until he gets all three newsletters on the same day again?
THIS IS URGENT MUST BE SUBMITTED TODAY!!!
Mathematics
1 answer:
valentina_108 [34]3 years ago
5 0
He would have to wait 40 more days 
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Four times the sum of a number and -3 is 7 more than quadruple the number. Write and solve the equation to find the number.
GrogVix [38]
4 [x+(-3)] = 4x + 7

distribute 4

4x - 12 = 4x + 7

subtract 4x

-12 = 7

no solution
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I’m stuck on this question can some help me ?????
Vilka [71]

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Step-by-step explanation:

7 0
3 years ago
There is another way to rank the difficulty of test questions using Networks: Each student gives scores for each problem, then w
Vlad [161]

Answer:

Step-by-step explanation:

Truly, on a single student level, the Massey method can be applied i.e. problems are ranked according to their level of difficulty for a single student.

Let us say there are 4 problems P1, P2, P3, P4 set in an exam where a student has to solve any two.

Assuming student 1 solves and scores more in P1 than in P2, r1>r2

student 2  more in P1 than P4 r1>r4

student 3 more in P2 than P4 r2>r4

student 4 more in P4 than P3 r4>r3

student 5 more in P2 than P3 r2>r3

and such many more cases.

then the Massey's model can be written as

P1 P2 P3  P4

\begin{bmatrix} 1 &-1 &0 &0\\ 1 &-1 &0 &0 \\ 0 &1 & 0 &-1 \\ 0 & 0 &-1 & 1 \\ 0 & 1 & -1 & 0 \end{bmatrix}.

\times \begin{bmatrix}r1 \\r2 \\r3 \\r4 \end{bmatrix}  =

\begin{bmatrix}y_{1} \\ y_{2} \\ y_{3} \\ y_{4}\\ y_{5}\end{bmatrix}.            

If Pi gives more score than Pj, the entry below Pi shall be 1 and below Pj shall be -1.

The rest of the entries shall be 0.

r1,r2,r3,r4,r5 are ranks .  

There may be more rows depending upon more combination of 2 problems.

Should in case more than one student solve the same combination and get scores in the same order, for instance, 12 students solve P1 and P2, for 7 of them r1>r2, then their scores can be averaged.

Normally, such systems are overdetermined, i.e., more rows than the number of unknowns, then it is solved by the Least square method ., as there shall be no a solution with least error is found out.

The overall ranking, in reverse order, shall give the ranking according to increasing difficulty.

7 0
3 years ago
If x = 2y + 3 and 4x – 5y = 9, what is the value of y?<br> A. 2<br> B. 1<br> C. -1<br> D. -2
maria [59]

Answer:

Steps shown in picture provided

6 0
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Round to the nearest tenth if necessary 10r =61​
Luden [163]

6.1 is the answer. R=6.1. All you have to do is isolate the variable.

8 0
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