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oee [108]
2 years ago
12

At a math contest 20problems we’re given each correct answer earned 5 points and 2 points were deducted for each incorrect answe

r Lenore answer all the problem receiving a score of 72 how many correct answer did she have
Mathematics
1 answer:
IRINA_888 [86]2 years ago
6 0

Answer:

she has 16 correct answer

Step-by-step explanation:

Mathematically ,we can translate this word problem into this system of equations :

\begin{cases}5x-2y=72&\left( 1\right)  \\ x+y=20&\left( 2\right)\end{cases}

\Longleftrightarrow \begin{cases}5x-2y=72&\left( 1\right)  \\ 2x+2y=40&2\times\left( 2\right)\end{cases}

\Longleftrightarrow \begin{cases}7x=72+40=112&\left( 1\right)+2\times(2)  \\ x+y=20&\left( 2\right)\end{cases}

\Longleftrightarrow \begin{cases}x=\frac{112}{7}=16   \\ y=20-x=20-16=4&\left( 2\right)\end{cases}

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Step-by-step explanation:

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3 years ago
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Five thousand raffle tickets are sold for $5 each. 50 winnings numbers will be chosen, 40 of which will win $100 each and 10 of
Allisa [31]

Answer:

Step-by-step explanation:

Given

there are 50 winning number out of which 40 get $ 100 each and 10 wins $ 1000 .

let x denotes the winning from a randomly selected ticket

x=100\ with\ Probability\ \frac{40}{5000}

x=1000\ with\ Probability\ \frac{10}{5000}

Expected value is given by

E(x)=100\times \frac{40}{5000}+1000\times \frac{10}{5000}

E(x)=0.8+2=2.8

and Expected return is given by

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5 0
3 years ago
Which describes the correct procedure when converting a number from scientific notation to standard notation if the power of 10
jenyasd209 [6]

Answer:

A. Move the decimal point to the left

Step-by-step explanation:

Given that:

The scientific notation = 10⁻¹⁰

Let recall;

That the standard notation usually took the form of an inverse:

For example;

Let say 10⁻¹ will be \dfrac{1}{10} in scientific notation;

SO, \dfrac{1}{10} = 0.1

Now; we are given 10⁻¹⁰ as a scientific notation,

To standard notation, we get:

10^{-10} = \dfrac{1}{100}

= 0.01

Thus, it is true to say that the decimal point will be moved to the left side when converting a number from scientific notation to standard notation if the power of 10 is  -10.

4 0
2 years ago
I need help on this for real
saveliy_v [14]

Answer:

x < 3

Step-by-step explanation:

Isolate the variable by dividing each side by factors that don't contain the variable.

8 0
2 years ago
Identify the coefficients in the expression below.<br><br> -6x+5y+4x+9
Montano1993 [528]

Answer:

3 coefficients in this expression are: -2x, 5y and 9 (natural number)

Step-by-step explanation:

-6x + 5y + 4x + 9

= -6x + 4x + 5y + 9

= -2x + 5y + 9

3 coefficients in this expression are: -2x, 5y and 9 (natural number)

Hope this help you :3

5 0
3 years ago
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