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Ksenya-84 [330]
2 years ago
7

I dont know how you’d work this out, someone please help! Thanks

Mathematics
1 answer:
Alinara [238K]2 years ago
8 0

Answer:

see photo attached for analysis

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Solve system by elimination <br> -9x+7y=22<br> 9x-5y=-26
alisha [4.7K]

Answer:

The solution would be (-4, -2)

Step-by-step explanation:

To find this simply add the two equations together.

-9x+7y=22

9x-5y=-26

----------------

2y = -4

y = -2

Now we have the y value, we can solve for the x value.

9x-5y=-26

9x-5(-2)=-26

9x+10=-16

9x=-36

x = -4

3 0
3 years ago
What is the least amount of additional money Sofia can spend to get the sushi they need?
garri49 [273]

Answer:

$

Step-by-step explanation:

6 0
3 years ago
A physical fitness association is including the mile run in its secondary school fitness test. The time for this event for boys
Ierofanga [76]

Answer:

A) 0.0107

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Mean of 440 seconds and a standard deviation of 40 seconds.

This means that \mu = 440, \sigma = 40

Find the probability that a randomly selected boy in secondary school can run the mile in less than 348 seconds.

This is the p-value of Z when X = 348. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{348 - 440}{40}

Z = -2.3

Z = -2.3 has a p-value of 0.0107, and thus, the correct answer is given by option A.

6 0
3 years ago
In the figure, ΔABC ∼ ΔDEF. Solve for x.  picture attached.
kotegsom [21]
Times 11 by 30 and 6 by x. You should get 6x=330. then divide 6 by 330 and you'll get 55. x=55<span />
7 0
3 years ago
Read 2 more answers
Please help.... me on this question
Sonja [21]

Answer:

a = 30 degrees; b = 60 degrees; and c = 105 degrees.

Step-by-step explanation:

Angle a and the 30 degree angle are vertical angles and thus are equal.

Since the interior angles of a triangle always add up to 180 degrees, 30 + b + 90 degrees = 180 degrees, so that b must be 60 degrees.

Angle c and the 75 degree angle are straight angles, and so their sum must be 180 degrees.  Thus, c = 105 degrees.

8 0
3 years ago
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