NEED HELP ASAPI need answers please

Mathematics

2 answers:

malfutka [58]3 years ago

8 0

Answer:

Step-by-step explanation:

10) Cos (x-y) = cos x cos y + sin x sin y

cos 4x cox 3x + sin 4x sin 3x = Cos (4x - 3x)

= cos x

11) = 2*(1² + 2) + 2*(2² + 2²)

= 2*3 + 2*(4+4)

= 6 + 2*8

= 6 + 16

= 22

12) (3) 4x² - 3x - 8 = 0

Reason:

Sum of roots = - Coefficient of x/coefficient of x² = -(-3)/4 = 3/4

Product of roots = constant / coefficient of x² = -8/4 = -2

Tanzania [10]3 years ago

4 0

Should’ve listened in class buddy

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Factorise completely 3m^2-48

Helen [10]

Answer:

3 (m^2 - 16)

Step-by-step explanation:

factoring means taking out a common multiple of all the terms in the expression

in this case, if you multiply 3 and m^2, 3 and -16, you would get 3m^2-48

so you take the three and put it outside of the parenthesis that contains the factored terms

this leaves you with 3 (m^2 - 16)

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3 years ago

A cylindrical canister contains 3 tennis balls. Its height is 8.75 inches and its radius is 1.5. The diameter of one tennis ball

Rudiy27

Find Volume of 1 tennis ball:----------------------------------------------Volume of 1 tennis ball = 4/3 x 3.14 x (2.5 ÷ 2)³
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3 years ago

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Jason can make 7 origami cranes in 10 minutes. How many minutes will it take to make 1505 origami cranes

Angelina_Jolie [31]

Answer:

The unit rate = 7/10 cranes per minute

Step-by-step explanation:

So, the number of minutes would it would take Kenny to fold 1505 cranes is

10/7 x 1505 = 2150 minutes

2150/60 = 35 5/6 hours

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