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cluponka [151]
2 years ago
9

Answer Please VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV

Mathematics
1 answer:
mash [69]2 years ago
6 0

Answer:

Step-by-step explanation:

D =\left[\begin{array}{cc}8&-4\\-14&12\end{array}\right] -\left[\begin{array}{cc}-1&-15\\0&7\end{array}\right] \\\\\\\\=\left[\begin{array}{ccc}8+1&-4+15\\-14-0&12-7\end{array}\right]\\\\\\=\left[\begin{array}{ccc}9&11\\-14&5\end{array}\right]

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Your science teacher recently gave a quiz to 28 students present in class. The class average was an 82.5. Five students that wer
irina [24]

Total students in the class who got the quiz = 28

The average of the class average was = 82.5

Five students that were absent made up the quiz after school and their scores were a 78, 89,92,99, & 63.

The formula for an average= (sum of values) / (count of values)

As the average is given as 82.5 and there were 28 students, so sum of the 28 values will be = 28\times82.5=2310

Total students of the class = 28+5(absent) = 33

For 33 students the total score was = 2310 +(78+89+92+99+63)

= 2731

So, average for 33 students will be = \frac{2731}{33} =82.757 or 82.76

So, the new class average is 82.76

3 0
3 years ago
A car is traveling at a speed of 30.0m/s encounters an emergency and comes to complete stop how much time will it take for the c
Travka [436]

Answer:

7.5\ seconds

Step-by-step explanation:

The Equation of motion is given by

v=u-at\\\\\ v:Final\ Velocity\\u:Initial\ Velocity\\a:acceleration\\t:time

Herev=0(as\ at\ the\ end\ car\ stops), u=30m/s,a=-4m/s^2

0=30-4t\\\\4t=30\\\\t=\frac{30}{4}\\\\t=7.5\ seconds

8 0
3 years ago
Find the area of the trapezoid.<br> 10.5 cm<br> 9.28 cm<br> 21.1 cm<br> [ ? ] cm2
san4es73 [151]

split the right triangle from the trapezoid and solve for that right triangle first

8 0
3 years ago
Determine the slope
ch4aika [34]

Answer:

3

Step-by-step explanation:

4 0
3 years ago
Find the area of a circle with radius, <br> r<br> = 40cm.<br> Give your answer rounded to 3 SF
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Area of circle = pi x r^2
= 22/7 x 40^2
= 5028.57
= 5030cm^2 (3 SF)
6 0
3 years ago
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