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Alja [10]
3 years ago
10

Joseph gives a math test to all the students in a middle school and notices that taller students have higher scores. He conclude

s that
taller people are better at math. This conclusion is
A)
not justified, since the taller students could have cheated.
B)
justified, especially if it can be repeated on a second test.
not justified, since taller students have had more math in school
D)
justified, assuming that the test was given fairly to all students.
Mathematics
1 answer:
MariettaO [177]3 years ago
7 0

Answer:

D) justified, assuming that the test was given fairly

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Andre’s school orders some new supplies for the chemistry lab. The online store shows a pack of 10 test tubes costs $4 less than
navik [9.2K]

10t = b - 4

12b+8t = $348

This is a system of equations. I’ll be solving through substitution.

In the first equation. solving for b (the easier variable to isolate) gives you:

b = 10t + 4

Substitute this into the second equation:

12(10t+4) +8t = 348

120t+48+8t = 348

128t = 300

t = 2.34375 —> round it to the nearest cent to get 2.34 dollars

b = 10t+4

b = 10(2.34)+4

b = 27.4 dollars

4 0
3 years ago
#4 home do I find which one it is?
lina2011 [118]
\bf \begin{array}{lllll}
solutions&graphs&slopes\\
----&----&----\\
\textit{exactly one}&
\begin{array}{llll}
\textit{the two lines intersect}\\
\textit{at one point}
\end{array}&\textit{different slopes}\\\\
infinitely\quad many&
\begin{array}{llll}
\textit{the two lines coincide}\\
\textit{one is right on top}\\
\textit{ of the other}
\end{array}&
\begin{array}{llll}
\textit{equal slopes}\\
\textit{equal y-intercepts}
\end{array}
\end{array}

\bf \textit{no solution}\qquad\quad &\textit{lines are parallel} \qquad &
\begin{array}{llll}
\textit{equal slopes}\\
\textit{different y-intercepts}
\end{array}
\end{array}

for example, let's look at the first set

y+3x =5   or  y = -3x+ 5
and               y = -3x + 2
                    y =  m  + b

the slopes are equal, the y-intercepts differ
that means, they're just parallel lines, no solution
8 0
4 years ago
Missy bought 3 umbrellas and 5 hats 27.00. Each umbrella coats the same amount. Each has costs the same amount. The price of a h
slava [35]
$4.00 is my answer.

3x + 5(3) = 27
3x = 27 - 15
3x = 12
x = 12÷3
x = 4
6 0
3 years ago
1. Angle AOF has what measurement according to the protractor? A. 40 B. 140 C. 60 D. 120
fredd [130]

Answer:

140 degrees

Step-by-step explanation:

Just measure from point A to point F giving you 140 degrees.

7 0
3 years ago
Please hellllp!Thank you so much.<br><br><br> (see the picture)
SpyIntel [72]

Answer:

147.33

Step-by-step explanation:

mupitply 26*17 and then dived my 3

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