1 answer:
The correct answer is a) Amy's solutions are correct.
Since she wanted the intersection point of the equations, she had to set them equal. Once she did she had
x²+3x-5=4x+1
Gathering the variables on one side of the equation, she subtracted 4x from each side:
x²+3x-5-4x=4x+1-4x
x²-x-5=1
Quadratics should be equal to 0 when we solve them, so she subtracted 1 from each side:
x²-x-5-1=1-1
x²-x-6=0
She then factored her expression; factors of -6 that sum to -1 are -3 and 2:
(x-3)(x+2)=0
Using the zero product property we know that either x-3=0 or x+2=0; therefore x=3 or x=-2.
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Step-by-step explanation:
that cheating wont fix.
The answer is Eight ninetieths
Pls mark as brainliest thx
<span>E[Y] = 0.4·1 + 0.3·2 + 0.2·3 + 0.1·4 = 2
E[1/Y] =0.4·1/1 + 0.3·1/2 + 0.2·1/3 + 0.1·1/4 = 0.4 + 0.15 + 0.0666 + 0.025?0.64
V[Y] =E[Y2]-E[Y]2= (0.4)·12+(0.3)·22+(0.2)·32+(0.1)·42-22= 0.4+1.2+1.8+1.6-4= 5-4 = 1</span>
I think the answer to it is 2,688
