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finlep [7]
3 years ago
13

What is (-a + b) (-c + d)?​

Mathematics
1 answer:
algol [13]3 years ago
4 0

Answer:

(−a+b)(−c+d)

=(−a+b)(−c+d)

=(−a)(−c)+(−a)(d)+(b)(−c)+(b)(d)

=ac−ad−bc+bd

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Can anyone help I keep getting it wrong
ivann1987 [24]

Answer:

C

Step-by-step explanation:

8 0
3 years ago
Raw scores on a certain standardized test one year were normally distributed, with a mean of 156 and a standard deviation of 23.
s344n2d4d5 [400]

Answer:

About 220 of the students scored less than 96

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 156 and a standard deviation of 23.

This means that \mu = 156, \sigma = 23

Proportion that scored less than 96:

p-value of Z when X = 96. So

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

Z = \frac{96 - 156}{23}

Z = -2.61

Z = -2.61 has a p-value of 0.00453.

About how many of the students scored less than 96?

0.00453 out of 48592.

0.00453*48592 = 220.1.

Rounding to the closest integer:

About 220 of the students scored less than 96

3 0
3 years ago
Tai ran from his house to a position 300 m south of his home in 100 seconds what was his velocity
ladessa [460]
Velocity = distance / time
             = 300m / 100s
             = 3 m/s
8 0
2 years ago
What is the estimate for 636,291 plus 280,329
Citrus2011 [14]

Answer:

this is simple addition: 916620

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
What does each number in the expression 0.05 x 300 represent?
Dmitry [639]

Answer: They are both numbers that are multiplied to make a product

Step-by-step explanation:

0.05 x 300 = 15

7 0
3 years ago
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