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3 years ago

Erin received the following scores on her last four spelling tests.

Mathematics

2 answers:

Alik [6]3 years ago

7 0

Answer: 0.8 I think...

Step-by-step explanation:

Well in order to change those numbers into a percent, to move the decimal two times to the right or left.

82% is already a decimal.

0.8 = 80% because you move the decimal two times to the right.

2125 = 21.25 because you move the decimal two times to the left

1720 = 17.20 because you move the decimal two times to the left

Tatiana [17]3 years ago

4 0

The second one, 82% is Erin's highest score

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X/w = z/y². solve for y

jek_recluse [69]

Answer:

Step-by-step explanation:

We can simplify (cross multiply) to get $xy^2=wz$

Then we easily simplify to get $y=\sqrt{\frac{wz}{x}},\:y=-\sqrt{\frac{wz}{x}};\quad \:w\ne \:0,\:x\ne \:0$

8 0

3 years ago

A culture started with 3000 bacteria. After 2 hours it grew to 3300 bacteria. Predict how many bacteria will be present after 16

bixtya [17]

Answer:

$6,430\ bacteria$

Step-by-step explanation:

we have a exponential function of the form

$y=a(1+r)^{x}$

where

y is the population of bacteria

a is the initial value

r is the rate of growth

x is the number of hours

we have

a=3,000 bacteria

$y=3,000(1+r)^{x}$

For x=2, y=3,300

substitute

$3,300=3,000(1+r)^{2}$

$(3,300/3,000)=(1+r)^{2}$

Apply square root both sides

$1+r=\sqrt{3.3/3}$

$r=\sqrt{3.3/3}-1$

$r=0.0488$

$r=4.88\%$

substitute in the equation

$y=3,000(1+0.0488)^{x}$

$y=3,000(1.0488)^{x}$

<u><em>Predict how many bacteria will be present after 16 hours</em></u>

For x=16 hours

substitute

$y=3,000(1.0488)^{16}$

$y=6,430\ bacteria$

6 0

3 years ago

Ebert used to make $22 an hour, but got a 10% raise.How much more will he make in a 40 hour work week with the raise?

Scilla [17]

The answer is 968 if because of add

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3 years ago

Please help . Determine the type of triangle that's drawn below.

Paha777 [63]

Answer:

scalene Right

Step-by-step explanation:

um it has a 90 degree so yea

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3 years ago

Using the chart below, determine which option would be the cheapest overall? Option Number of Months Down Payment Interest Rate

Gekata [30.6K]

Answer:

Answer:

Option 1, by $851.70

Step-by-step explanation:

Option 1 total:

$8000 + $765.44*5*12 = $53926.40

Option 2 total:

$8000 + $626.25*4*12 + 0.38*$43995 = $54778.10

The difference:

$54778.1 - $53926.40 = $851.70

As we see the option 1 is cheaper by $851.70

Correct answer choice is the last one

Step-by-step explanation:

8 0

2 years ago