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natta225 [31]
3 years ago
9

(2.8 x 10^8) / (7 × 10^2)

Mathematics
2 answers:
Zigmanuir [339]3 years ago
8 0

Answer:

7=x/5; she has earned 35 points

Step-by-step explanation:

(5)7=x/5(5)

so, you multiply each side by five, since the inverse operation of division is multiplication, then solve.

7(5)=35

x/5(5)=x

so x (the number of points she earned) is equal to 35.

raketka [301]3 years ago
4 0

Answer:

(2.8 x 10^8) / (7 × 10^2) = 400'000

Step-by-step explanation:

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the function f is defined by f(x)=150/x-z where z is a constant. find z if the value of f at x=1/5 is equal to 250
malfutka [58]

Answer:

x = -1 \frac{1}{20}

Step-by-step explanation:

f(\frac{1}{5}) = 120, therefore we can create this equation:

120 = 150 ÷ (\frac{1}{5} - z)

cross-multiply to get: 24 - 120z = 150

-120z = 126

z = -1 \frac{3}{60}

8 0
3 years ago
Read 2 more answers
The sum of two numbers is ten. the difference between them is 8 . find the two numbers
alexira [117]

x+y=10

x-y=8, x=y+8

y+8+y=10

2y=2

y=1

So, x=10-y=10-1=9.

Numbers Would be 9 and 1.


3 0
4 years ago
To calculate the cost of painting his silo, a farmer must find its height. The farmer uses a cardboard square to line up the top
tankabanditka [31]

Answer:

Height of the silo = 18 feet.

Step-by-step explanation:

From the figure attached BC is the length of the silo and the height of the farmer is 5 ft.

Farmer is standing at 8 ft distance from the silo.

From triangle AEC,

tan(∠CAE) = \frac{CE}{AE}

                 = \frac{5}{8}

m(∠CAE) = tan^{-1}(\frac{5}{8})

               = 32°

m∠BAE = 90° - 32° = 58°

From the triangle ABE,

tan58° = \frac{BE}{AE}

BE = 8tan58°

BE = 12.8 ft

Total height of the silo = BE + EC

                                         = 12.8 + 5

                                         = 17.8

                                         ≈ 18 ft          

Therefore, total height of the silo is 18 ft.

3 0
3 years ago
40 is 80% of what number?
agasfer [191]

Answer:

50

Step-by-step explanation:

.80n = 40

n = 40 divided by .80

40/8/10  = 400 / 80 = 50

Best Of Luck,

- I.A. -

6 0
3 years ago
You start with a penny which doubles each day for 30 days. How much money would you have after 30 days?
Radda [10]

Answer:

$555,765.76

Step-by-step explanation:

1

2

4

8

16

32

64

128

256

512

1024

2048

4096

8192

16282

32564

65128

13256

26512

53024

106048

212096

424192

868384

1736768

3473536

6947072

13894144

27788288

55576576=

555,765.76

6 0
3 years ago
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