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irina [24]
3 years ago
5

Essica is a custodian at Oracle Arena. She waxes 20 \text{ m}^220 m 2 20, space, m, start superscript, 2, end superscript of the

floor in \dfrac35 5 3 ? start fraction, 3, divided by, 5, end fraction of an hour. Jessica waxes the floor at a constant rate.
Mathematics
1 answer:
Butoxors [25]3 years ago
7 0
261828372wdjdnendjdnjdhdhss
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Can anyone answer these questions
SOVA2 [1]

Answer:

see explanation

see explanationStep-by-step explanation:

21

Note that

(a - \frac{1}{a})²

= a² - 2 + \frac{1}{a^2}

= a² + \frac{1}{a^2} - 2

= 11 - 2

= 9

Thus

(a - \frac{1}{a})² = 9 ( take the square root of both sides )

a - \frac{1}{a} = 3

22

Since the expression is a perfect square, then

(4x + 5y)²

= 16x² + 40xy + 25y²

Comparing coefficients, then

a - 1 = 40 ( add 1 to both sides )

a = 41

23

99² - 87² ← is a difference of squares and factors as

= (99 - 87)(99 + 87)

= 12 × 186 = 1152, thus

24a = 1152 ( divide both sides by 24 )

a = 48

3 0
4 years ago
Help me plsssszzzzzzzzzzzzzzzzzzz​
OlgaM077 [116]
Use the formula 1/2•b•h to find your answer
5 0
3 years ago
The cost of health insurance is $900 per month. The cost of an operation for a dramatic injury is $500,000. The chances of someo
lord [1]

Answer:

Yes, It is better to buy the insurance.

Step-by-step explanation:

Given Data:

Cost of Health Insurance for a month = 900$ per month

As 20 Years = 20*12 months = 240 months

Cost of Health Insurance for 20 years = 900 * 240

Cost of Health Insurance for 20 years = 216,000$

Insurance claim in case of having dramatic injury = Cost of Dramatic Injury = 500,000$

Insurance claim in case of having no dramatic injury = 0$

Chances of dramatic injury in 20 years = P(A) = 47.3%

Chances of not having dramatic injury in 20 years = P(B) = 100% - 47.3%

Chances of not having dramatic injury in 20 years = P(B) = 52.7%

Expected Insurance Claim for 20 years:

Expected Insurance Claim for 20 years = (Chances of having dramatic injury in 20 years * Insurance claim) + (Chances of not having dramatic injury * Insurance claim)

Expected Insurance Claim for 20 years = P(A) * 500,000$ + P(B) * 0$

Expected Insurance Claim for 20 years = 47.3% * 500,000 + 52.7% * 0

Expected Insurance Claim for 20 years = 236500 + 0

Expected Insurance Claim for 20 years = 236,500$

Expected Profit:

As expected insurance claim is 236,500$ is more than the cost of health insurance for 20 years and we are expected to have profit of 20,500$, thus we should take the health insurance.

3 0
3 years ago
Factorize: 4m^2-y^2+4m+1​
notsponge [240]

Answer:

(2m + 1 + y) (2m + 1 - y)

Step-by-step explanation:

steps are done in the above photo and i have also written the identifies

5 0
3 years ago
What is 38% of 232? around to the nearest tenth.
max2010maxim [7]

Answer: 88.2

..........................

4 0
3 years ago
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