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Alona [7]
3 years ago
13

if the mean score of 12 students in maths is 5 and the mean score of another 10 students is 6. Calculate the average score of 22

students to the nearest whole number​
Mathematics
2 answers:
Kaylis [27]3 years ago
7 0
The answer is 5.(5+6) divided by 2=5.5
Alexandra [31]3 years ago
7 0

Answer:

the nearest whole number​: 5

Step-by-step explanation:

(12 x 5) + (10 x 6) = 120

120 / 22 = 5.45

since the first digit of the fractional part is 4, that's less than 5.

So the nearest whole number is 5

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Two cars leave the same place at the same time, but drive in opposite directions along a straight road. one car averages 35 mi/h
Goshia [24]

As we do not know the other cars avg speed we can not tell the answer. Please repeat the question.

6 0
3 years ago
One morning, John drive 5 hours before stopping to eat. After lunch, he. increased his speed by 10 mph. If he completed a 500-mi
Marrrta [24]
So  he drove 5hrs, before lunch, now, he was going at speed, say "r", after he ate, he sped up by 10mph, so, his rate is whatever "r" is, plus 10, or " r + 10 ", after lunch

we know the whole trip took 10hrs, so, is 5hrs before lunch and 5hrs after lunch

we also know the whole trip was 500miles, so if he drove, say "d" miles before lunch, after lunch he drove the slack after lunch, or " 200 - d "

recall, your d = rt, distance = rate * time

\bf \begin{array}{lccclll}
&distance&rate&time\\
&-----&-----&-----\\
\textit{before lunch}&d&r&5\\
\textit{after lunch}&500-d&r+10&5
\end{array}
\\\\\\

\begin{cases}
\boxed{d}=5r\\
500-d=(r+10)5\\
----------\\
500-\boxed{5r}=(r+10)5
\end{cases}
\\\\\\
\cfrac{500-5r}{5}=r+10\implies 100-r=r+10

and I'm sure you know what that is
6 0
3 years ago
What equation is equivalent to x + 8 = 21
san4es73 [151]

Answer:

x= 13

Step-by-step explanation:

x + 8 = 21

x + 8-8 = 21-8

x = 13

7 0
3 years ago
Read 2 more answers
A company produces metal slabs for industrial use. The slabs come in three thicknesses: 5in, 10in., 15 in. The weights of each t
Dimas [21]

5, 10 ,15  

divide each by 5

1,2, 3

so the ratios should be 1,2,3

Metal 1 : divide by 150

1,2,4

Metal 2 divide by 130

1,2,3

Metal 3  divide by 310

1,2,3

Metal 4 divide by 140

1,2,3

Metal 1 is not proportional

Choice A

4 0
3 years ago
The perpendicular bisectors of two sides of a triangle meet at point that belongs to the third side. Prove that this is a right
devlian [24]
<h3>Step-by-step explanation:</h3>

The point of intersection of the perpendicular bisectors of a triangle is the circumcenter, the center of the circle that contains the three triangle vertices.

If that center is on one side, that side must be a diameter of the circle. The diameter cuts the circle into two arcs, each of which measures 180°.

The third vertex of the triangle and its two legs form an inscribed angle that subtends an arc of 180°. The measure of that angle is half the measure of the arc, so the angle measures 90° and is a <em>right angle</em>.

A triangle with a right angle is a right triangle. QED

3 0
3 years ago
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