All categories

2 years ago

The mean of nine numbers is 12 , if one of the numbers is removed ,

Mathematics

1 answer:

lys-0071 [83]2 years ago

8 0

Answer:

Step-by-step explanation:

Mean of 9 numbers is 12.

Total of 9 numbers:

9*12 = 108

Mean of 8 numbers is 13.

Total of 8 numbers:

8*13 = 104

Removed number:

108 - 104 = 4

You might be interested in

Right answers only will give brainliest!!!

vladimir2022 [97]

Answer:

10.7 cm^2

Step-by-step explanation:

First find the area of the base

A = 1/2 *2*1.7

A =1.7

Then find the area of one of the sides

A = 1/2 (2*3)

A = 3

There are 3 sides and they are identical

Multiply one of the sides by 3

3*3=9

Add the sides and the base together

9+1.7

10.7 cm^2

4 0

2 years ago

Read 2 more answers

What are the coordinates of the x-intercepts of the parabola y = x² - 8x + 15?

tamaranim1 [39]

Answer:

(3, 0) and (5, 0)

Step-by-step explanation:

we have

$y=x^{2}-8x+15$

we know that

The x-intercepts are the values of x when the value of y is equal to zero

For y=0

$x^{2}-8x+15=0$

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^{2}-8x+15=0$

$a=1\\b=-8\\c=15$

substitute in the formula

$x=\frac{-(-8)\pm\sqrt{-8^{2}-4(1)(15)}} {2(1)}$

$x=\frac{8\pm\sqrt{4}} {2}$

$x=\frac{8\pm2} {2}$

$x=\frac{8+2} {2}=5$

$x=\frac{8-2} {2}=3$

x=3, x=5

therefore

The x-intercepts are (3,0) and (5,0)

4 0

2 years ago

What is the slope of the line that passes through the points (9, -7) and (-10, -10)?

vredina [299]

Answer:

sorry I don't know I want to tell but I can't

please subscribe my channel Volcano Headshot

5 0

2 years ago

The 200$ camera was on sale 15% off what was the price

Flauer [41]

Answer: $170
15% off 100 is $15 x2 is 30

5 0

2 years ago

Read 2 more answers

How would I find the are without height and what would the formula be

gregori [183]

The height is 6tan(60)=10.39 then plug that in to trapezoid area formula
(11+6+15)/2*10.39=166.24

8 0

2 years ago