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3 years ago

1.(5y+4)^2 2.(5y+4)^3 3.a=5yb=4 Help!

1 answer:

7 0

1)
(a+b)²=a²+2ab+b²

(5y+4)²
a=5y
b=4

Therefore:
(5y+4)²=(5y)²+2(5y)(4)+(4)²=25y²+40y+16

Answer: (5y+4)²=25y²+40y+16

2)
(a+b)³=a³+3a²b+3ab²+b³

(5y+4)³
a=5y
b=4

therefore:
(5y+4)³=(5y)³+3(5y)²(4)+3(5y)(4)²+(4)³=125y³+60y²+240y+64

Answer: (5y+4)³=125y³+60y²+240y+64

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2 years ago

The admission fee at an amusement park is $2.00 for children and $6.80 for adults. On a certain day, 388 people entered the park

san4es73 [151]

Answer: 188 children and 200 adults were admitted

Step-by-step explanation:

Let x represent the number of children that were admitted.

Let y represent the number of adults that were admitted.

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3 years ago

The area of a circle (A) is given by the formula A= pi*r to the second power, where r is the radius. The formula to find r is _.

podryga [215]

Answer:

The correct option for the first blank is A. (A/pi) to the power of 1/2

The correct option for the second blank is A. 4.15

Step-by-step explanation:

1. Let's review the information provided to us to answer the questions correctly:

Area of a circle (A) = π * r², where r = radius

2. The formula to find r is ________________:

A = π * r²

r² = A/π

√r² = √ A/π

r = √A/π

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The correct option for the first blank is A. (A/pi) to the power of 1/2

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We use the formula we got for the first blank, this way:

r = (A/pi) to the power of 1/2

Replacing with the real values, we have:

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The correct option for the second blank is A. 4.15

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3 years ago