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2 years ago

HELP!! Please I need help with this question

Mathematics

1 answer:

lawyer [7]2 years ago

7 0

Z-4.5 = -1.5

Add 4.5 to each side:
z = -1.5 + 4.5z = 3

Cedric is correct because he used the inverse of subtraction and added 4.5.

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9) Which figure has 90° rotational symmetry?

IceJOKER [234]

The answer is B. Thank you

6 0

3 years ago

Find the area of a sector with a 4 inch radius and arc measure of 90 degrees. use 3.14 for pi.

gulaghasi [49]

Answer:

$\frac{90}{360} \pi{r}^{2} \\ \frac{1}{4} \times 3.14 \times { 4}^{2} \\ = 12.56 {in}^{2}$

hope this helps you....

6 0

3 years ago

The scores on a psychology exam were normally distributed with a mean of 60 and a standard deviation of 10 . A failing grade on

tensa zangetsu [6.8K]

Answer:

The cutoff for a failing score was 40,

Approximately 2.3% of the students failed.

Step-by-step explanation:

Given,

Mean, $\mu=60$

Standard deviation, $\sigma=10$

Let x represents the cutoff for a failing score,

Thus, according to the question,

$\frac{x-\mu}{\sigma}=-2$

$\frac{x-60}{10}=-2$

$x-60=-20$

$x=-20+60$

$x=40$

Thus, the cutoff for a failing score is 40,

∵ P(<-2) = 0.02275 = 2.275 % ≈ 2.3 %

Hence, Approximately 2.3 % of the students failed. 

7 0

2 years ago

A recipe calls for 1/2 cup of celery,2 1/3 of water and 3/4 cups of carrots. What the combined amont of these three ingredients?

lys-0071 [83]

Answer:

43/12

Step-by-step explanation:

First we must find a common denominator for all 3 fractions, 1/2 cup, 2 1/3 cup, and 3/4 cup all share 12 as a common denominator.

However, let's convert 2 1/3 cup into an improper fraction: there are 2 (3/3 cups) here multiply (3/3) and (2/1) you get 6/3. Finally, add the remaining 1/3 to 6/3 and you get 7/3.

Now, to get all these fractions to have the same common denominator.

(1/2) ×(6/6)=(6/12)

(7/3)×(4/4)=(28/12)

(3/4)×(3/3)=(9/12)

Add them all together and your answer is: (43/12)

7 0

3 years ago

The Jackson family needs to travel from

eimsori [14]

Answer:

the second choice. and its shorter by 17 miles

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers