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3 years ago

Please Help!

Mathematics

2 answers:

Juliette [100K]3 years ago

7 0

Your center would be (3,-4)

DanielleElmas [232]3 years ago

7 0

Hope this helps you.

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The earned run average (ERA) a of a baseball pitcher varies directly as the number of earned runs r and inversely as the number

7nadin3 [17]

Answer:

The number of earned runs is 28.

Step-by-step explanation:

Earned runs average:

The earned runs average of a pitcher is the number of runs the he/she gives each 9 innings on average.

Find the number of earned runs when the pitcher has an ERA of 2.25 after pitching 112 innings in the next season.

Solved by proportions, using a rule of three.

For each 9 innits, the pitcher gives 2.25 runs. How many runs for 112 innings?

9 innings - 2.25 runs

112 innings - x runs

Applying cross multiplication:

$9x = 2.25*112$

$x = \frac{2.25*112}{9}$

$x = 28$

The number of earned runs is 28.

6 0

3 years ago

PLSSSS HELLLPPPPPPP How much would it cost to buy 3.4 pounds of Bartlett pears and 2.1 pounds of Concorde pears? Concorde pears

kirill [66]

Answer:

$13.10

Step-by-step explanation:

Concard $3.00 2.1 $6.30

Osband $3.00

Green Anjou $4.00

Bartlett $2.00 3.4 $6.80

Red Anjou $5.00

TOTAL = $13.10

5 0

3 years ago

Determine whether y varies directly with x. If so, find the constant of variation k and write the equation.

anyanavicka [17]

The correct answer is that y does not vary directly with x.

Explanation:
If y varies directly with x, this means that it would fit the equation y=kx for every point in the set.

For the first point, we would have 11=7k; this would mean that k=11//7.
For the second point, we would have 13=8k; this would mean that k=13/8.

Checking using proportions shows us that 11/7 does not equal 13/8:
cross multiply, and you have 11*8=7*13, or 88=91.

This is not true, so k is not a constant, and y does not vary directly with x.

7 0

3 years ago

Read 2 more answers

Which statement comparing x² + 10 and x + x + x is true when x=−5 ?

MissTica

When comparing x^2 + 10 and x + x + x equals to:
x^2 +10 is greater than x + x + x when x = -5
Because -5^2 + 10 = 25 + 10 = 35
and -5 + -5 + -5 = -15
So, 35 > -15

5 0

3 years ago

Read 2 more answers

What is the probability that she chose the four students so that exactly ONE of them is a junior?

8090 [49]

Answer:

B) 0.246

Step-by-step explanation:

The desired probability is the sum of the probabilities of each of the ways one junior can be chosen. If we let a, b, c, d represent the ratio of juniors in classes 1 to 4, then this probability is ...

p(1 junior) = (a)(1-b)(1-c)(1-d) + (1-a)(b)(1-c)(1-d) + (1-a)(1-b)(c)(1-d) + (1-a)(1-b)(1-c)(1-d)

We can simplify this a little bit to ...

p(1 junior) = (1-a)(1-b)(1-c)(1-d) × (a/(1-a) +b/(1-b) +c/(1-c) +d/(1-d))

___

So, for {a, b, c, d} = {9/15, 12/15, 6/15, 3/15} = {3/5, 4/5, 2/5, 1/5} the probability of interest is ...

p(1 junior) = (2/5·1/5·3/5·4/5) × (3/2 + 4/1 + 2/3 + 1/4) = 24/625 × 77/12

p(1 junior) = 154/625 ≈ 0.246

_____

Comment on the sum we're computing

Each of the probabilities in the first sum above is ...

p(junior in given class) · p(not a junior in the other 3 classes)

3 0

3 years ago