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Elena-2011 [213]
3 years ago
8

Solve -4a² - 1/5b + 1/7cif a = 3, b = -5, c = -21​

Mathematics
1 answer:
frutty [35]3 years ago
8 0

Answer:

Step-by-step explanation:

-4(3)² - 1/5(-5) + 1/7(-21)

-4(9) + 1 - 3

-36 + 1 - 3

-35 - 3 = -38

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A company has six employees.The salary of five of the employees are P2200,P1300,P800,P940 and P560.When the sixth employee is in
Dafna1 [17]

Answer:

First answer is 1200

Second answer is 900 for each new employee

Step-by-step explanation:

First answer:

2200+1300+800+940+560+x = 7000

5800+x = 7000 subtract 5800 from both sides and you get your answer

x = 1200

Second answer:

x = 900.  Each of the two employees made 900 a month or 1800 a month for both of them.

To find the average we take the total salaries and divide by the number of people to find the average salary.  In this case, we know the average and we know all of the salaries, but two.  We can figure this out.

(7000 + 2x)/8 = 1100  multiple both sides by 8 to clear the fraction/

7000 +2x = 8800  Subtract both sides by 7000

2x = 1800  Divide both sides by 2

x = 900

3 0
2 years ago
Please help find “b” for me!
svp [43]

Answer:

12

Step-by-step explanation:

Pythagorean Theorem states that

a² + b² = c²

plug in your terms

9² + b² = 15²

81 + b² = 225

then subtract 81 from 225 to get your b²

b² = 144

then find the square root of 144

the square root is 12 because 12 x 12 = 144

3 0
3 years ago
Read 2 more answers
Which lines are perpendicular to the line y – 1 = (x+2)? Check all that apply. y + 2 = –3(x – 4) y − 5 = 3(x + 11) y = -3x – y =
Harlamova29_29 [7]
The answers:

a, c, & e


your welcome
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4 0
4 years ago
What is -9.6 repeating written as a fraction
kaheart [24]
-9.6=-9\frac{6}{10}=-9\frac{6:2}{10:2}=-9\frac{3}{5}=-\frac{9\cdot5+3}{5}=-\frac{45+3}{5}=\boxed{-\frac{48}{5}}\\\\or\ other\ method\\\\-9.6=-\frac{96}{10}=-\frac{96:2}{10:2}=\boxed{-\frac{48}{5}}
5 0
4 years ago
A sports store sells bicycle baskes at $40.00 for two. Another sports store sells bicycle baskets for $110 for five. Which store
Dennis_Churaev [7]

The first store sells baskets at the better rate because 40.00 divided by 2 is 20.00 dollars for one but 110 dollars divided by 5 is 22 dollars so by going to the first store you are saving 2 dollars.


4 0
3 years ago
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