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TiliK225 [7]
3 years ago
5

A loaded moving truck is traveling 25 mph faster than a freight train. In the time it takes the train to travel 90 miles, the tr

uck travels 140 miles. Find the speed of the truck.
Mathematics
1 answer:
Alexus [3.1K]3 years ago
5 0

Answer:

70

Step-by-step explanation:

if the train is traveling 90 miles in 2 hours then its going 45 mph so 25 + 45 = 70 and 70 mph is 140 in 2 so then the equation is true

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Suppose y varies directly with x. if y=-3 when x=5 find y when x=-1
Scrat [10]
\bf \begin{array}{cccccclllll}
\textit{something}&&\textit{varies directly to}&&\textit{something else}\\ \quad \\
\textit{something}&=&{{ \textit{some value}}}&\cdot &\textit{something else}\\ \quad \\
y&=&{{ k}}&\cdot&x

&&  y={{ k }}x
\end{array}
\\ \quad \\
\textit{we know that, when}
\begin{cases}
y=-3\\
x=5
\end{cases}\implies y=kx\implies (-3)=k(5)

solve for "k", to find the "constant of variation",
then plug it back in the y = kx, to get the equation
now
what's is y when x = -1?
well, just plug that in the equation with the found "k" value,
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3 0
3 years ago
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scoundrel [369]

Answer:

A. The first graph

Step-by-step explanation:

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7 0
3 years ago
I’m so confused on how to do this -?
ANTONII [103]

Answer:

256

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4 0
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Maurinko [17]
He used distributive property 
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On discovering that her family had a 70% risk of heart attack, Erin took a treadmill test to check her own potential of having a
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