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Kipish [7]
3 years ago
11

Nola caminó por un sendero a un ritmo constante durante 10 minutos. Su cambio de elevación fue de -200 pies. Luego continuó cami

nando durante otros 20 minutos a un ritmo diferente. Su cambio de elevación para esta parte de la caminata fue de -300 pies. ¿Durante qué parte de la caminata bajó a un ritmo más rápido? Explica tu razonamiento.​
Mathematics
1 answer:
Karolina [17]3 years ago
8 0

Answer:

fgrth hetrhw w 4yrty

Step-by-step explanation:

wjy kqgelur o;euro;gwegrg;oycro;a

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A chemical company makes two brands of antifreeze. The first brand is 65% pure antifreeze, and the second brand is 90% pure anti
Brums [2.3K]

\bf \begin{array}{lcccl} &\stackrel{solution}{gallons}&\stackrel{\textit{\% of }}{antifreeze}&\stackrel{\textit{gallons of }}{antifreeze}\\ \cline{2-4}&\\ \textit{1st brand}&x&0.65&0.65x\\ \textit{2nd brand}&y&0.90&0.9y\\ \cline{2-4}&\\ mixture&40&0.8&32 \end{array}~\hfill \to \begin{cases} x+y&=40\\ \boxed{x}=40-y\\ \cline{1-2} 0.65x+0.9y&=32 \end{cases} \\\\[-0.35em] ~\dotfill

\bf \stackrel{\textit{substituting in the 2nd equation}}{0.65\left( \boxed{40-y} \right)+0.9y=32}\implies 26-0.65y+0.9y=32 \\\\\\ 26+0.25y=32\implies 0.25y=6\implies y=\cfrac{6}{0.25}\implies \blacktriangleright y=24 \blacktriangleleft \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{since we know that}}{x=40-y\implies }x=40-24\implies \blacktriangleright x=16 \blacktriangleleft

7 0
3 years ago
Read 2 more answers
A professor gives his students 9 essay questions to prepare for an exam. Only 3 of the questions will actually appear on the exa
Talja [164]

Answer: 84

Step-by-step explanation:

The total number of the questions is 9

Possible question is 3

This is combination

Therefore n=9 and r=3

Combination formula=n! / ((n-r)! r!)

9C3=9! /((9-3)! 3!)

=362880 /(6! 3!)

=362880/4320

=84

4 0
3 years ago
Please help. i dont understand what i have to do and how to get it. thank you
rjkz [21]

Answer:

\left[\begin{array}{ccc}9\\10\\\end{array}\right]

Step-by-step explanation:

Evaluate 3a by multiplying each element by 3

3a = 3 \left[\begin{array}{ccc}2\\4\\\end{array}\right] = \left[\begin{array}{ccc}3(2)\\3(4)\\\end{array}\right] = \left[\begin{array}{ccc}6\\12&\\\end{array}\right], then

3a + b

= \left[\begin{array}{ccc}6\\12\\\end{array}\right] + \left[\begin{array}{ccc}3\\-2\\\end{array}\right] ← sum corresponding elements

= \left[\begin{array}{ccc}6+3\\12-2\\\end{array}\right]

= \left[\begin{array}{ccc}9\\10\\\end{array}\right]

8 0
3 years ago
Find the solution set 3x^2+5x+2=0
Elis [28]

Answer:   x = -1, and x = -2/3

Step-by-step explanation:

3x^2+5x+2=0

(x+1)(3x+2) = 0

x = -1, and x = -2/3

8 0
3 years ago
(24,-8) (36,1) (48,10) What is the y- intercept​
inna [77]
The y-intercept is -26.
8 0
3 years ago
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