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andrew11 [14]
3 years ago
7

A triangular pyramid and its net are shown. Rain uses Calculations below to conclude that the surface area of a triangular pyram

id is 238.5 sq inches. Is rain correct? Use the drop down menus to explain your reasoning.
Mathematics
1 answer:
Harman [31]3 years ago
5 0

Answer:

Rain is correct, calculates correctly, 238.5 square inches

Step-by-step explanation:

The given triangular pyramid is shown with the dimensions.

The surface area of the triangular pyramid is given by :

$A=\frac{1}{2}\left(a \times b\right) + 3\left(\frac{1}{2}\times b\times s\right)$

$A=\frac{1}{2}\left(10 \times 8.7\right) + 3\left(\frac{1}{2}\times 10\times 13\right)$

$A=43.5+(3\times 65)$

$A=43.5+195$

$A=238.5 \ \text{inche}^2$

Therefore, the surface area of the triangular pyramid is = 238.5 square inches.

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You want to distribute 7 candies to 4 kids. If every kid must receive at least one candy, in how many ways can you do this?
puteri [66]

Answer:

15

Step-by-step explanation:

lets begin to set up this question. i personally find questions like these easiest when i begin to set up ideas to help my brain process it better, for example:

person a

person b

person c

person d

we know that each (person) must receive at least 1 candy. we also know that we have 7 candies. therefore if we want do draw this out :

person a- 1

person b- 1

person c- 1

person d -1

notice that we now have given away 4 of the 7 candies. now we have 3 candies left. we can simply:

person a- 2

person b-2

person c-2

person d- 1

but, keep in mind that there are still many more ways that we can distribute the candies to other kids. the question we are asked is how may ways can we do this. since i have already illustrated the question, you can either learn how to put this into an equation, or experiment how many variations there are. the answer, either way is 15.

4 0
3 years ago
From a club 25 people in how many ways can a group of five members be selected to attend conference? A group of 5 members can be
IgorLugansk [536]

Answer:

²⁵C₅ = 53130

Step-by-step explanation:

number of people in the club = 25

number of people to be selected in the group to attend conference = 5

number of ways of selecting this group from 25 people is same as selecting 5 objects from 25 distinct objects = ²⁵C₅ (Selection)

= \frac{25!}{5!(25-5)!}

= \frac{25!}{5!(20)!}

= 21×22×23×5

= 53130

∴ <u>Number of ways of selecting this group from 25 people = 53130</u>

8 0
3 years ago
9x^2-16=0 <br> I need to solve
vivado [14]
<span><span><span>Its x=± \frac{4}{3}
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3 0
3 years ago
Please someone help me with this one
cestrela7 [59]

Answer:

Tarquin is correct

Step-by-step explanation:

2(x+6)+2(2x+11)= 2x+12+4x22= 6x+34= 2(3x+17)

7 0
3 years ago
Alyssa had to read 110 pages over the weekend. By Saturday, she had completed 60 pages. What percent did she complete? Which pro
Naddika [18.5K]

Answer:

i believe the answer is c or 110/60=x/100

Step-by-step explanation:

4 0
3 years ago
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