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3 years ago

15

In a psychology class, 55 students have a mean score of 97.6 on a test. then 18 more students take the test and their mean score

is 70. what is the mean score of all of these students together? round to one decimal place. mean of the scores of all the students =

1 answer:

nikdorinn [45]3 years ago

7 0

The mean of this problem is 1334

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Three times a number minus another number is -3. The sum of the numbers is 11. Find the numbers

MatroZZZ [7]

The first equation is

$3x-y=-3$

The second equation is

$x+y=11$

If you sum the two equations you'll cancel y:

$4x=8 \iff x=2$

And since the sum must be 11, we have y=9.

8 0

4 years ago

If 4 : 9 is equivalent to (5x+13) : 63, then what is the value of x?

Aleksandr [31]

$\large{\underline{\underline{\pmb{\sf{\color{yellow}{Answer:}}}}}}$

The value of x is 3

Step-by-step explanation:

$\textsf{\underline{\large{To find :-}}}$

The value of x

$\textsf{\underline{\large{Given :-}}}$

4 : 9 = (5x + 13) : 63

$\textsf{\underline{\underline{\large{Solution :-}}}}$

we can write this as

$\sf \frac{4}{9} = \frac{(5x + 13)}{63}$

Now we will cross multiply the values

$\sf 4 \times 63 = 9(5x + 13) \\ \\ \sf 252 = 45x + 117 \\ \\ \sf 252 - 117 = 45x \\ \\ \sf 135 = 45x \\ \\ \sf \frac{135}{45} = x \\ \\ \sf \orange {3 = x}$

5 0

2 years ago

Find the area of a triangle with a base length of 3 units and a height of 4 units.

Tpy6a [65]

Answer:

area of triangle

= 1/2 × base × height

= 1/2 × 3 units × 4 units

= 6 units²

5 0

3 years ago

Read 2 more answers

Please help me solve correct one gets Brainliest -6x+30

Finger [1]

Answer:

Factor −6x+30

−6x+30

=6(−x+5)

Step-by-step explanation:

That's all there is

6 0

3 years ago

Find b, given that a = 20, angle A = 30°, and angle B = 45° in triangle ABC

Kamila [148]

<span>The side b is opposite to the angle B, applying the law of the sines, we have:

</span> $\frac{a}{sinA} = \frac{b}{sinB}$
$\frac{20}{sin30^0} = \frac{b}{sin45^0}$
$\frac{20}{ \frac{1}{2} } = \frac{b}{ \frac{ \sqrt{2} }{2} }$
$20* \frac{ \sqrt{2} }{2} = b* \frac{1}{2}$
$\frac{20 \sqrt{2} }{2} = \frac{b}{2}$
$2*b =2*20 \sqrt{2}$
$2b = 40 \sqrt{2}$
$b = \frac{40 \sqrt{2} }{2}$
$\boxed{b = 20 \sqrt{2} }$

6 0

3 years ago

Read 2 more answers