Answer:
Under 99% confidence level we can say that mean speed of the new chips is greater than that of the old chips
Step-by-step explanation:
: Mean speed of the new chip is the same as the old chip
: Mean speed of the new chip is greater than the old chip
to calculate the z-statistic we can use the formula:
z=
if we put the numbers then
z=
=4.8171
The probability of this z-statistic is < 0.001 Therefore Under 99% confidence level we can say that mean speed of the new chips is greater than that of the old chips
The dimensions of the rectangle are 10 by 4
Step-by-step explanation:
The area of a rectangle is given by product of the length and width.
Area=l*w where l is the length and w is the width.
Assume the width to be x
The length is 6 units greater than the width,which is x+6
The area will be x(x+6) = x²+6x
This area x²+6x= 40
Form a quadratic equation as x²+6x-40=0
Solving the quadratic equations;
x²+6x-40=0
x²+10x-4x-40=0
x(x+10)-4(x+10)=0
(x-4)(x+10)=0
x-4=0
x=4 taking a positive value for length then;
width will be x=4 units
Length will be x+6 = 4+6=10
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Area of rectangle : brainly.com/question/10865708
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Keywords: Area, rectangle
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Answer:
h = 13
Step-by-step explanation:
Given the area of a triangle as 84.5 .
The correct value to complete the formula to calculate for the height h is 13 .
Area of a triangle = 1/2 b x h
b = base
h = height
Using the above formula
84.5 = 1/2 x 13 x h
84.5 = 13/2 x h
84.5 = 6.5 x h
84.5 = 6.5h
Divide both sides by 6.5 to get h
84.5/6.5 = 6.5h /6.5
13 = h
h = 13