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3 years ago

Whatt are some inportant rules to dividing and multipling positives and negitives.

1 answer:

4 0

Positive × Positive = Positive
3 × 2 = 6
m × n = mn

Positive × Negative = Negative
8 × -4 = -32
m × -n = -mn

Negative × Negative = Positive
-5 × -4 = 20
-m × -n = mn
(-x) × (-x) = x²

The same rules apply for division as multiplication.

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A store pays $245 for radio. The store marks the radio up 65%. What is the selling price for the radio? Explain answer and earn

liraira [26]

So what you want to do is multiply 245 by 1.65 (because it’s +65%) and by doing that you get $404.25 :)

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3 years ago

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Each of 28 students in Romi’s class raised at least $25 during jump-a-thin. What is the least amount of money the class raised

Anna [14]

28 x 25 = $700

Answer: The class raises at least $700.

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3 years ago

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45 +2.50m = 3.75m what is the answer

zhannawk [14.2K]

m = 36

Work

45 + 2.50m = 3.75m

-3.75m -3.75m

45 - 1.25m = 0

- 45 - 45

-1.25m = -45

-1.25 -1.25

m = 36

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3 years ago

Find three right triangles based upon the Pythagorean Triple of 8, 15, and 17. Explain how you know these are triangles.

Luba_88 [7]

A^2 + b^2 = c^2
8^2 + 15^2 = 17^2
64 + 225 = 289
289=289
It is a triangle because the numbers match the Pythagorean Theorem.

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3 years ago

Some of Mrs. Turay’s eighth graders took the PSAT test. Score totals of ten of her students are below. Calculate the mean and th

den301095 [7]

Answer:

(a) Mean=74

(b) Median=70

Step-by-step explanation:

We have been given a data set of PSAT scores of Mrs. Turay's eight graders. We are asked to find mean and median of the given data set.

(a) Let us find mean of data set by dividing the sum of given scores by the number of students.

$\text{Mean}=\frac{60+62+67+69+70+70+71+75+76+120}{10}$

$\text{Mean}=\frac{740}{10}=74$

Therefore, the mean test score will be 74.

(b) Now let us find median of our given data set. We have been given that number of students is 10, therefore, our median will be the average of 5th and 6th term.

60, 62, 67, 69, 70, 70, 71, 75, 76, 120.

We can see that 5th term is 70 and 6th term is 70 as well.

$\text{Median}=\frac{70+70}{2}$

$\text{Median}=\frac{140}{2}$

$\text{Median}=70$

Therefore, the median test scores will be 70.

(c) We can see that our data set has an outlier score as 120, which has increased the mean. Mean score is greater than median score. Since median is not affected by extreme value outliers, therefore, median will be the best measure of center for given test scores.

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3 years ago

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