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3 years ago

The time taken for a journey on a motorway varies inversely as

Mathematics

1 answer:

Westkost [7]3 years ago

3 0

Time that will be taken at speed of 45 miles/hr is 1.8 hrs

Step-by-step explanation:

Step 1: Given the speed of the journey = 54 miles/hr and time = 1.5 hours. Find the distance of the journey using the speed formula.

Distance = Speed × Time

= 54 × 1.5 = 81 miles

Step 2: Calculate the time taken for this journey given speed = 45 miles/hr

TIme = Distance/Speed

= 81/45 = 1.8 hrs

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Automobile engineers wanted to check the effect of a new automatic transmission on mileage. They selected 50 cars of the same ma

daser333 [38]

Answer:

d. Twenty-five cars are randomly selected with the new transmission and 25 with the old transmission.

Step-by-step explanation:

A hypothesis test on the difference between the means must satisfy the following conditions

1) the samples must be randomly selected

2) each sample must have a known standard deviation

3) the samples must be independent

4) the samples must be from normal distribution

Hence only part d gives the right answer.

3 0

3 years ago

12 times 1/8 how do you cross multiply this

ra1l [238]

Answer:

12/1 times 1/8 = 1.5

Step-by-step explanation:

You multiply 12 by 1 to get 12, then divide 12 by 8 to get 1.5

7 0

3 years ago

Read 2 more answers

Amy, Dan, and Mike are competing in a cooking competition. They all used different amounts of milk from a container holding 6 ga

zmey [24]

Answer:

Amy: 0.78 Gallons

Dan : 0.14 Gallons

Mike: 0.5 Gallons

Answer: Amy

Step-by-step explanation:

Look closely

8 0

3 years ago

The diagram can be represented by the equation 25=2+6x

Allushta [10]

Answer: x = 23/6

Step-by-step explanation:

4 0

3 years ago

Please help ASAP! Find the midpoint between the complex numbers.

Ivenika [448]

$\bf \begin{cases}
z1=9-9i\implies &(9~,~-9)\\
z2=10-9i\implies &(10~,~-9)
\end{cases}$

$\bf ~~~~~~~~~~~~\textit{middle point of 2 points }\\\\
\begin{array}{ccccccccc}
&&x_1&&y_1&&x_2&&y_2\\
% (a,b)
&&(~ 9 &,& -9~) 
% (c,d)
&&(~ 10 &,& -9~)
\end{array}\qquad
% coordinates of midpoint 
\left(\cfrac{ x_2 + x_1}{2}\quad ,\quad \cfrac{ y_2 + y_1}{2} \right)
\\\\\\
\left( \cfrac{10+9}{2}~~,~~\cfrac{-9-9}{2} \right)\implies \left( \cfrac{19}{2}~~~,~~\cfrac{-18}{2} \right)
\\\\\\
\left( \cfrac{19}{2}~~~,~~-9 \right)\implies \left( 9\frac{1}{2}~~~,~~-9 \right)$

3 0

3 years ago