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vladimir2022 [97]
3 years ago
15

Can you please explain how you did it

Mathematics
1 answer:
Nadya [2.5K]3 years ago
3 0

Answer:

205

Step-by-step explanation:

10 1/4 *20=(10*4+1)/4 *20=41*20/4=41*5=205

the rule is...... a b/c=(a*c+b)/c

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Find the value of x in the isosceles triangle shown below.
joja [24]
Answer: C. 10

Explanation:

Take half right triangle from the isosceles triangle:

We get side lengths:

12/2 = 6, 8, and x

And use Pythagorean’s theorem to find x:

6^2 + 8^2 = x^2
36 + 64 = x^2
100 = x^2
10 = x
7 0
3 years ago
Administrators at a large public high school are interested in their students’ standardized test scores. Last year, the mean sco
ratelena [41]

Answer:

The appropriate hypotheses for performing a significance test is:

H_0: \mu = 51

H_1: \mu > 51

Step-by-step explanation:

Last year, the mean score on the state’s math test was 51. The administrators have trained the teachers in a new method of teaching math hoping to raise the scores on this standardized test this year.

At the null hypothesis, we test if the mean score this year is the same as last year, that is:

H_0: \mu = 51

At the alternate hypothesis, we test if the mean score improved this year from last, that is:

H_1: \mu > 51

The appropriate hypotheses for performing a significance test is:

H_0: \mu = 51

H_1: \mu > 51

8 0
3 years ago
There are 500 people in a building. 20% of half of them went out. 15% of those who went out came back in. How many people are in
Setler79 [48]

Answer:

415people

Step-by-step explanation:

20%of250=100people

15%of the 100people=15people

So 100 went out remaining(500-100)400

Then 15 returned=400+15

<u>4</u><u>1</u><u>5</u>

5 0
3 years ago
Read 2 more answers
Find three consecutive numbers that add up to 60​
lawyer [7]

Answer:

60/3=20

20/21

Step-by-step explanation:

6 0
3 years ago
What is the surface area of this triangular prism rounded to the nearest tenth?
finlep [7]

Answer:

The surface area of the triangular prism is 145.3  ft^2

Step-by-step explanation:

Step 1:  Finding the two area of two triangles

Area of the triangle  =  \frac{1}{2} (base \times height})

Area of the triangle  = \frac{1}{2} (9.8\times  5.33})

Area of the triangle  = 26.117

Area of 2 triangles  =  52.234

Step 2: Finding the area of the side rectangles

Area of the rectangle  = length  \times breadth

Area of the rectangle  1 = 6.2 \times 3.8  = 23.56 ft^2

Area of the rectangle  2  = 8.5 \times 3.8 = 32.3 ft^2

Area of the rectangle  3  = 9.8 \times 3.8 = 37.24 ft^2

Step 3: surface area of the triangular prism.

Surface area of the triangular prism =  52.234 + 23.56 + 32.3 + 37.24

Surface area of the triangular prism = 145.334 ft^2

5 0
3 years ago
Read 2 more answers
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