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3 years ago

Urgent please!!! I really don’t understand it, tysm to anyone who can answer thissss :))))

Mathematics

1 answer:

Vikki [24]3 years ago

6 0

Answer:

(ax + by + cz)/(a + b + c)

Step-by-step explanation:

Average = Sum / Number

In terms of the scores we calculate the sum as:

ax + by + cz

The number is the sum of the frequencies:

a + b + c

Mean average score is:

(ax + by + cz)/(a + b + c)

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A coin dealer buys a coin for $850 and sells it for $1190. Find the percent of change.

grin007 [14]

(percent change) = ((new value)/(old value) -1)*100%
.. = (1190/850 -1)*100%
.. = 40%

The coin was sold for a price 40% higher than its purchase price.

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4 years ago

If the ends of the base of an isosceles triangle are at (2,0) & (0,1) & the eqn of one side is

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4 years ago

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Find the difference. 9 - (-10)

Salsk061 [2.6K]

Answer:

Step-by-step explanation:

9 - (-10) = ?

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8 0

3 years ago

The Miller family visited Mama's kitchen and ordered 4 hamburgers and 3 medium fries and paid $17.35. James ordered a medium dri

Lady_Fox [76]

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$\left\{\begin{array}{ccc}4\cdot11.26+3y=17.35\\x=3.25\end{array}\right\\\left\{\begin{array}{ccc}4\cdot3.25+3y=17.35\\x=3.25\end{array}\right\\\left\{\begin{array}{ccc}13+3y=17.35\\x=3.25\end{array}\right\\\left\{\begin{array}{ccc}3y=17.35-13\\x=3.25\end{array}\right\\\left\{\begin{array}{ccc}3y=4.35\\x=3.25\end{array}\right\\\left\{\begin{array}{ccc}y=1.45\\x=3.25\end{array}\right\\$

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3 years ago

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KIM [24]

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3 years ago