All categories

3 years ago

I will give brainlest, please help me!

Mathematics

2 answers:

Leona [35]3 years ago

7 0

Answer:

Number of people: 5

Number of handshakes: 10

Number of people: 6

Number of handshakes: 15

Number of people: 7

Number of handshakes: 21

Number of people: n

Number of handshakes: (n * (n-1))/2

Step-by-step explanation:

(n * (n-1))/2

Use the equation above to solve for # of handshakes

Gemiola [76]3 years ago

6 0

Answer:

1,3,6,10,15,21,27

Step-by-step explanation:

You might be interested in

7. Two classes have car washes to raise money for class trips. A portion of the

postnew [5]

Based on the information given, the percentage for the trip earnings rate for class A and B is 80% and 70% respectively.

<h3>How to calculate percentage.</h3>

From the information given, the trip earnings rate for A will be calculated thus:

= 16/20 × 100.

= 80%

The trip earnings rate for B will be calculated thus:

= 14/20 × 100

= 70%

Learn more about percentages on:

brainly.com/question/24304697

8 0

2 years ago

Calcylate the volume of this regular solid

MatroZZZ [7]

Answer:

V = 270 cm³

Step-by-step explanation:

Remember your volume formula: V=<em>lwh</em>

So, plug in all your variables and multiply:

(6)(5)(9) = 270

And we have our final answer!

8 0

4 years ago

Two functions are shown in the table below.

SVETLANKA909090 [29]

Answer:

$(d)\ x = 4$

Step-by-step explanation:

Given

$f(x) = -x^2 + 4x + 12$

$g(x) = x + 8$

Required

Find x such that: $f(x) = g(x)$

This gives:

$-x^2 + 4x + 12 = x+8$

Collect like terms

$-x^2 + 4x -x + 12 -8=0$

$-x^2 + 3x +4 =0$

Expand

$-x^2 + 4x - x+4 =0$

Factorize

$x(x - 4) - 1(x-4) = 0$

Factor out x - 1

$(x- 1)(x - 4)=0$

Solve:

$x =1\ or\ x = 4$

8 0

3 years ago

The sum of four numbers is 20 and their average is 5. When a fifth is added, the new average is 6. What is the fifth number?

ipn [44]

Answer:

Step-by-step explanation:

We'll note the numbers as $x_{n}, x_{n+1} ...$

$x_1 + x_2 + x_3 + x_4 = 20\\Avg = 5\\\frac{x_1 + x_2 + x_3 + x_4 + x_5 }{5} = 6 = \frac{20 + x_5}{5}\\ 4 + \frac{x_5}{5} = 6\\\\frac{x_5}{5} = 2\\\x_5 = 10$

8 0

3 years ago

Read 2 more answers

What is the answer for 3/4X2 2/5-5/6

kari74 [83]

1.5, -0.43 is the answer

7 0

3 years ago

Read 2 more answers