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katovenus [111]
2 years ago
13

F (x)= x+ - 5x2 - 6x - 10

Mathematics
1 answer:
umka21 [38]2 years ago
7 0

2x34 ds and search the scientific calculator and use it

Step-by-step explanation:

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A metallurgist wants to make 130 grams of an alloy that is to be 20% copper. She has samples that are 14% copper and 22% copper.
bija089 [108]

Answer:

She should use 32.5 g of the sample that contains 14%

Step-by-step explanation:

Here, we want to know the number of grams of the sample that contains 14% copper that should be used

let the number of grams that contains 14% copper to be used be x

Then the number of grams of 22% will be 130-x

Thus, mathematically;

0.14(x) + 0.22(130-x) = 0.2(130)

0.14x + 28.6 - 0.22x = 26

0.22x - 0.14x = 28.6 - 26

0.08x = 2.6

x = 26/0.08

x = 32.5

8 0
2 years ago
Josh has 22 1/2 acres of land he is selling 1/4 acre lots how many lots does Josh have to sell (show your work)
vampirchik [111]
22.5/0.40 = 5.625 Divide the acres by 1/4 and you have your answer
3 0
3 years ago
7d^2+10 HELPPP SOVE THIS
Amanda [17]
So you just plug in the X value of the number that d represents for example if I plug in 2 for d

7(2)^2+10=38
4 0
3 years ago
A square has a side length of 36 feet.This square is dilated by a scale factor of 2/3 to create a new square .What is the side l
Vaselesa [24]

Answer:

24 ft

Step-by-step explanation:

36 x 2/3= 24

It is dilated by a scale of 2/3 which means it will be smaller.

8 0
3 years ago
the resendez family pays a monthy base charge for their electricity plus a charge for each kilowatt-hour used. In april, their e
IRISSAK [1]

Answer:

about $0.20 per kilowatt-hour. i hope this helps

Step-by-step explanation:

6 0
2 years ago
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