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e-lub [12.9K]
3 years ago
13

Evaluate the expression 3xy - 2x^2 for x=4 and for y = 3 helpp

Mathematics
2 answers:
hram777 [196]3 years ago
5 0
3*4*3-2*4^2 = 36-32 = 4

hope helped 
Bogdan [553]3 years ago
5 0

Good evening my friend.


The first  thing we need to thing about is to replace each values by the number that they give for them. 

So let's start by replacing 4 every where we see x and 3 everywhere there is y


3(4)(3) - 2(4)²

36 - 2(16)

36- 32

= 4


I hope that's help :) 

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Joint-Serve Prosthetics spends 43% of its total expenses for payroll. It increased its total expenses when it spent $250,000 for
Leni [432]
Answer: $2,150,000

Explanation: Let

T = Total expenses of Joint-Serve

Then, before the company acquired robotic assemblers, the expenses allocated for payroll is given by

Expenses for Payroll = 43% of Total Expenses
Expenses for Payroll = 0.43T     (1)
(Because 43% = 0.43)

Because the total expenses increased by $250,000 after spending for robotic assemblers, the total expenses = T + 250,000

So, the payroll expense is now calculated as

Expenses for Payroll = 38% of Total Expenses
Expenses for Payroll = 0.38(T + 250,000)     (2)
(Because 38% = 0.38 and total expenses = T + 250,000)

By comparing equations (1) and (2),

0.43T = 0.38(T + 250,000)
\\ 0.43T = 0.38T + 0.38(250,000)
\\ 0.43T = 0.38T + 95,000
\\ 0.43T - 0.38T = 95,000
\\  \frac{0.05T}{0.05}  =  \frac{95,000}{0.05} 
\\ \boxed{T = \$ 1,900,000}

Thus, the total expense before the purchase of robotic assemblers is T = $ 1,900,000. Therefore, the total expense after purchasing the robotic assemblers is T + 250,000 = 1,900,000 + 250,000 = $2,150,000  
6 0
3 years ago
Emilio paid $287.50 in taxes to the school district that he lives in this year. This year’s taxes were a 15% increase from last
m_a_m_a [10]
Well if it was increased from last year, then it must be dealing with devision to find out the price of last year...
So when you divide the number 287.50 by 15% You get to the total of:
<span>1 916.66667 
</span>So your answer is: <em>$1,916.67 </em>
8 0
3 years ago
Based on experience, the probability that an incoming email is spam (an undesired message of solicitation) is 38%. If three emai
SCORPION-xisa [38]

Answer:

0.0549

0.7617

0.2383

Step-by-step explanation:

Given that:

Probability that incoming email is spam ;

P(spam) = 0.38

If three emails are in my inbox, what is the probability that:

A. All three messages are spam.

P(1st message being spam) * p(second message being spam) * p(3rd message being spam)

= (0.38) * (0.38) * (0.38)

= 0.054872

= 0.0549

B. At least one of the three messages are spam.

1 - p(none of the 3 messages are spam)

P(none of the 3 messages are spam)

P(not spam) = 1 - p(spam) = 1 - 0.38 = 0.62

1 - [P(not spam) * p(not spam) * p(not spam)]

1 - (0.62 * 0.62 * 0.62)

= 1 - 0.238328

= 0.761672

= 0.7617

C. None of the three messages are spam.

P(not spam) = 1 - p(spam) = 1 - 0.38 = 0.62

P(not spam) * p(not spam) * p(not spam)

(0.62 * 0.62 * 0.62)

= 0.238328

= 0.2383

7 0
3 years ago
8-2 3/4 =<br><br>show the work​
Misha Larkins [42]

<em><u>ANSWER</u></em>

8-2........3/4 but you have you ADD some people dont know that 8-2= 6

and so 6/1 + 3/4 is 24/4

5 0
3 years ago
Helppppppp.... I cant understand
vovikov84 [41]
6/25

Hope this helps (:
3 0
3 years ago
Read 2 more answers
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