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3 years ago

Hi! I'm confused as to how to get the answer for this -> 3(y+7) = 2y - 5

Mathematics

1 answer:

Sindrei [870]3 years ago

3 0

Try this solution:

3(y+7)=2y-5;

3y+21=2y-5;

3y-2y= -21-5;

y=-26.

answer: -26

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Use long division to determine the decimal equivalent to 8/9

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See image below it keeps going .

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4 years ago

Which equation is equivalent to 60% of 25? Select all that apply.

elena-14-01-66 [18.8K]

Answer:

tHERE ARE NO EQUATIONS

Step-by-step explanation:

60% of 25

= 60/100 x 25

= 0.6 x 25

= 15

7 0

3 years ago

HELP HELP HELP A quadratic function models the graph of a parabola. The quadratic functions, y = x2 and y = x2 + 3, are modeled

Softa [21]

Answer:

From x = -2 to x = 0, the average rate of change for both functions is negative

The quadratic function, y = x2, has an x-intercept at the origin

Step-by-step explanation:

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3 years ago

The weight of potato chip bags filled by a machine at a packaging plant is normally distributed with a mean of 15.0 ounces and a

suter [353]

Answer:

97.73% of bags weigh more than 14.8 ounces.

Step-by-step explanation:

We are given that the weight of potato chip bags filled by a machine at a packaging plant is normally distributed with a mean of 15.0 ounces and a standard deviation of 0.1 ounces.

Let X = weight of potato chip bags filled by a machine

So, X ~ N( $\mu=15.0,\sigma^{2} =0.1^{2}$ )

The z-score probability distribution for normal distribution is given by;

Z = $\frac{ X -\mu}{\sigma}$ ~ N(0,1)

where, $\mu$ = mean weight = 15.0 ounces

$\sigma$ = standard deviation = 0.1 ounces

The Z-score measures how many standard deviations the measure is away from the mean. After finding the Z-score, we look at the z-score table and find the p-value (area) 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.

So, percentage of bags that weigh more than 14.8 ounces is given by = P(X > 14.8 ounces)

P(X > 14.8 ounces) = P( $\frac{ X -\mu}{\sigma}$ > $\frac{14.8-15.0}{0.1}$ ) = P(Z > -2) = P(Z < 2)

= 0.9773 or 97.73%

Now, in the z table the P(Z $\leq$ x) or P(Z < x) is given. So, the above probability is calculated by looking at the value of x = 2 in the z table which has an area of 0.9773.

Hence, 97.73% of bags weigh more than 14.8 ounces.

4 0

4 years ago

Question 7: e math instruction, can u guys help me?

eimsori [14]

A) n(0) = 20 because n(0) = 20(2)^0 and anything to the power 0 is 1. The reason that any number to the zero power is 1 is because any number to the zero power is just the product of no numbers at all, which is the multiplicative identity, 1

Thus, n(0) = 20(1) = 20. In terms of the situation, if 0 days have passed since Monday, 20 people know about the rumor.

b) n(-2) = 20(2)^-2 = 20* 1/(2^2)
=20/(2^2) = 20/4 = 5.

In terms of the situation, two days before Monday, 5 people know the rumor.

6 0

3 years ago