3 years ago

I need help with this Khan plz

Mathematics

1 answer:

tigry1 [53]3 years ago

8 0

Find the constant of proportionality

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If y varies directly as x, and y is 12 when x is 1.2, what is the constant of variation for this relation? A) 1 B) 10 C) 10.8 D)

Anit [1.1K]

$\bf \begin{array}{cccccclllll}&\\
\textit{something}&&\textit{varies directly to}&&\textit{something else}\\ \quad \\&\\
\textit{something}&=&{{ \textit{some value}}}&\cdot &\textit{something else}\\ \quad \\&\\
y&=&{{ k}}&\cdot&x&\\
&\\
&& y={{ k }}x&\\
\end{array}& \\\\\\
\textit{we know that }
\begin{cases}
y=12\\
x=1.2
\end{cases}\implies y=kx\implies 12=k\cdot 1.2$

solve for "k" to find "k", or the "constant of variation"

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4 years ago

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I NEED HELP PLS!!!! I DONT UNDERSTAND THIS!! PLS TELL ME THE CORRECT ANSWER AND HOW YOU GOT IT STEP BY STEP!!!!

padilas [110]

I like to start with changing fractions to decimals. It seems easier that way.
5/8 = 0.625 cups

Now divide 4 by 0.625
4 / 0.625 = 6.4

Noor can offer 6 cups with an extra 2/5 of a cup left. He can offer the 2/5 of a cup to a friend, so he can offer 7 friends some hot chocolate!

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3 years ago

Anthony is buying a new skateboard. for $295. The sales tax is 4.75%, what will he pay in tax?

Anon25 [30]

Answer:

$4.75

Step-by-step explanation:

multiply 4.75% by 100 and then add/ move the decimal place 2 times

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3 years ago

Which expression is equivalent to |a|≤5 ?

sladkih [1.3K]

Answer:

I think its the first one but not 100 % sure

Step-by-step explanation:

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Consider the polar curve r = 4sin(2θ). What is the length of each petal, and how many petals does the graph have? a The length o

VashaNatasha [74]

Answer:

d The length of each petal is 4, and the number of petals is 4.

Step-by-step explanation:

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2 years ago