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2 years ago

9

Kamden is a mind-reading alien. He had each friend draw and look at a card, then he guessed whether the card had a star on it. T

he two-way frequency table below shows data on guess and true status of the cards the friends drew.

1 answer:

torisob [31]2 years ago

7 0

Answer: This is what Khan Academy said the answer was

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What is the zero in the quadratic function f(x)= 9x^2-54x-19?

Alex17521 [72]

Answer:

6.33... and 0.333...

Step-by-step explanation:

The quadratic formula is

$x=\frac{-b+\sqrt{b^2-4ac} }{2a}$ .

It is important because while some quadratics are factorable and can be solved not all are. The formula will solve all quadratic equations and can also give both real and imaginary solutions. Using the formula will require less work than finding the factors if factorable. We will substitute a=9, b=-54 and c=-19.

$x=\frac{-b+/-\sqrt{b^2-4ac} }{2a}\\x=\frac{-(-54)+/-\sqrt{(-54)^2-4(9)(-19)} }{2(9)}\\x=\frac{54+/-\sqrt{2916+684} }{18}$

We will now solve for the plus and the minus.

The plus,,,

$x=\frac{54+\sqrt{3600}}{18}\\x=\frac{54+60}{18}\\x=\frac{114}{18}\\x=6.3$

and the minus...

$x=\frac{54-\sqrt{3600}}{18}\\x=\frac{54-60}{18}\\x=\frac{-6}{18}\\x=-0.333...$

8 0

2 years ago

5. Write the equation of the line graphed below.

Pepsi [2]

Answer:

y=2x+3

Step-by-step explanation:the rise over run is 2/1 indicating that the slope is 2. the line also passes through 3 which means the y intercept is 3.

7 0

1 year ago

You could win a giant jar of jelly beans if only you could guess how many are in the jar. You find a smaller jar such that the g

Gennadij [26K]

The giant jar of jelly beans is 5 times the size of the smaller jar. If there are 83 jelly beans in the smaller jar, the giant jar can be represented as 5(83).

5(83) = 415 jelly beans

4 0

1 year ago

Read 2 more answers

Derrick has $3500 in a savings account that earns 12% annually. If the interest is not compounded, how much interest will he ear

netineya [11]

I'm thinking I no this one hold up

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2 years ago

A group of neighborhood children have a lemonade stand. They spend $5 on supplies. The function graphed shows the earnings they

Elanso [62]

Hey!

Your answer would be:

x-intercept: The number of cups of lemonade that must be sold to break even.

y-intercept: Money spent before the sale of the first cup of lemonade.

Took the test <3

7 0

1 year ago