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mihalych1998 [28]
2 years ago
5

Can anyone give me a hand with 18 and 19 please

Mathematics
2 answers:
Brums [2.3K]2 years ago
3 0

Answer: (a-b)-(2x+y)

Step-by-step explanation: The answer for number 18. (The first pair of parentheses are optional.)

docker41 [41]2 years ago
3 0
The answers are
A

C

D


Make sure you double checked

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Find the length of “b”, to the<br> nearest tenth, using the<br> Pythagorean Theorem.
Tresset [83]

Answer: b= 11.2

10^2 + b^2 = 15^2

100 + b^2 =  225

b^2 = 125

b= \sqrt{125}

b= 11.2

Step-by-step explanation:

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3 years ago
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Find the missing measure for a right circular cone given the following information. Find L.A. if r = 6 and h = 8
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A geometric progression has a third term of 20 and a sum of infinity which is 3 times the first term. Find the first term ​
Anna007 [38]

Answer: the first term is 45

Step-by-step explanation:

Step 1: The formular for the nth term is ar^n-1 and since we're solving for the third term ar^3-1 = ar² which is equal to 20

So ar²= 20 and we make this equation i

Step 2: the formular for the sum of infinity is Sn = a/(1-r) and according the question the sum of infinity is equals to 3 *A ( A means the first term)

Further simplification gives us

3a= a/(1-r)

We simplify Futher by multiplying both sides by (1-r)

3a.(1-r) = a/(1-r).(1-r)

3a(1-r)=a

= 3a-3ar=a

Make 3ar the subject of the formula

3ar= 2a and lets make this equation (ii)

Step 3: From the first equation since ar²=20, let's make a the subject of the formula by dividing both sides by r²

Ar²/r² = 20/r²

A=20/r²lets make this equation (iii)

Step 4: subtitle a as 20/r² into equation (ii)

Since 3ar=2a

Then 3.(20/r²).r = 2. 20/r²

= (60/r²) .r = 40/r²

60/r = 40/r2

Multiplying both sides by r² gives us

60r = 40

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= 3r= 2

Divide both sides by 3 gives us

= r = 2/3

Step 5: substitute r for 2/3 in equation i

ar²= 20

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= a.4/9 = 20

= 4a = 180

= a = 180/4

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Answer:

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I hope this helped, have a great day!! <3

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