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DedPeter [7]
3 years ago
9

I need to correct my math problem

Mathematics
1 answer:
raketka [301]3 years ago
4 0
From 4 to 10, it is enlarge by 2.5 times
from 6 to 15, the scale factor is also 15/6=2.5
so the answer is 2.5
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I don't understand how to go about solving this equation more specifically the "y". Any help is appreciated. (:
Archy [21]

Answer:

y^2/x^6

apply exponent rule:

x^-2/x^4=1/x^4-(-2)=y/y^-1 x^4 -(-2)

then you subtract 4-(-2)=6

y/x^6 y^-1

cancel out the common factor: y^-1 and you get

y^2

------

x^6

6 0
2 years ago
If tan a = 3/4 find the value of sin 3a
Effectus [21]
T=-1

sinA=sin(π/2-3A), A=2nπ+π/2-3A, 4A=2nπ+π/2, A=nπ/2+π/8 where n is an integer.

Also, π-A=2nπ+π/2-3A, 2A=2nπ-π/2, A=nπ-π/4.

The hard way:

cos3A=cos(2A+A)=cos(2A)cosA-sin(2A)sinA.

Let s=sinA and c=cosA, then s²+c²=1.

cos3A=(2c²-1)c-2c(1-c²)=c(4c²-3).

s=c(4c²-3) is the original equation.

Let t=tanA=s/c, then c²=1/(1+t²).

t=4c²-3=4/(1+t²)-3=(4-3-3t²)/(1+t²)=(1-3t²)/(1+t²).

So t+t³=1-3t², t³+3t²+t-1=0=(t+1)(t²+2t-1).

So t=-1 is a solution.

t²+2t-1=0 is a solution, t²+2t+1-1-1=0=(t+1)²-2, so t=-1+√2 and t=-1-√2 are solutions.

Therefore tanA=-1, -1+√2, -1-√2 are the three solutions from which:

A=-π/4, π/8, -3π/8 radians and these values +2πn where n is an integer.

Replacing π by 180° converts the solutions to degrees.

3 0
3 years ago
The population (in thousands) for Beta City, t years after January 1, 2005 is modeled by the quadratic function P(t)=.7t^2+12t+2
ratelena [41]

Answer:

La. Madonna polenta Chico beloo

6 0
3 years ago
Solve: <br> y=-6x-7<br> 12x+2y=-14
mixer [17]

Answer:

this equation can't be solved we can't find the value of x n y

5 0
2 years ago
Please help will be pleasured:)
Talja [164]
The answer to this is the second option.
7 0
3 years ago
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