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bekas [8.4K]
3 years ago
7

Cos(-25°) = cos25° really need help with this

Mathematics
1 answer:
kolezko [41]3 years ago
8 0
Cos25=cos_rad(((5*pi)/36)) is your answer.
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17.45 how do you mixed numbers and reduce
Vadim26 [7]

<em>Hello!</em>

<em>17.45 as a mixed fraction is </em><em>17 9/20</em><em>.</em>

<em>If this is not correct, please comment below and I will try my best to find the right answer.</em>

5 0
3 years ago
Read 2 more answers
For brainiest:):):):):):):):)
mars1129 [50]

Answer:

A1) 125

A2) 47.5%

B) 30

Step-by-step explanation:

Remember 'of' in this sentence means times(*). % shows a certain number/100.

a1) 48% 'of' what number is 60?

(let unknown number be x)

48/100 *x=60

Solve the equation, and the answer is x=125

a2) what percentage 'of' 120 is 57?

(let the unknown percentage be x)

(x/100)*120=57

x=47.5%

b) 24 students= 80% of the total number of students

1%=24/80

100% of the total number of students=30

So, there are total of 30 students

8 0
3 years ago
Find a such that the solution of y'' + y' − 2y = 0, y(0) = a, y' (0) = 1 tends to zero as t → +∞.
Kay [80]

Answer:

Step-by-step explanation:

y'' + y' − 2y = 0, y(0) = a, y' (0) = 1

Auxialary equation is

m^2+m-2=0\\m=-2,1

General solution is

y=Ae^{-2x} +Be^x

y(0) = A+B =a

y'(0) = -2Ae^{2x} +Be^x = -2A+B = 1

Eliminate B to get

3A =a-1

We know that y tends to 0 when x tends to infinity for any finite A

i.e. a should be a finite real number.

8 0
3 years ago
Sales rise from £400 a week to £504 a week. Calculate a percentage increase
soldier1979 [14.2K]

Step-by-step explanation:

previous =£400

present=£504

percentage=(£504-£400)/£504*100

=104/£504*100

=20.63%

3 0
3 years ago
Which weighs the least 2 centigrams 2 grams 2 hectograms 2 kilograms or 2 milligrams
Mekhanik [1.2K]
To answer the question above, use conversion factors and dimensional analysis. In this given, it is easier to use grams as the basis. 

a. (2 centrigrams) x (1 gram / 100 centigrams) = 0.02 grams
b. 2 grams 
c. (2 hectograms) x (1 gram / 0.01 hectogram) = 200 grams
d. (2 kilograms) x (1 gram / 0.001 kilogram) = 2000 grams
e. (2 milligrams) x (1 gram / 1000 millimeters) = 0.002 grams

Thus, the answer is 2 milligrams. 
7 0
3 years ago
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