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victus00 [196]
4 years ago
14

the mean weight of 8 girls is 55kg and the mean weight of a group of boys if 52kg. the mean weight of all the students is 53.2kg

. how many boys are there?
Mathematics
1 answer:
Amanda [17]4 years ago
6 0
Add 55kg and 52 kg and 53.2 kg and divide by 8 and that will give you your answer
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If g(x)= 4x^2-16 we’re shifted 9 units to the right and 1 down, what would the new equation be
ser-zykov [4K]

Answer:

A

Step-by-step explanation:

A shift along the x-axis is the opposite in the graph than in the equation. Rather than the x-intercept(s) being negative if the equation is x - n, they become positive; likewise for the other way around. A is the only answer that follows this rule. However, the y-intercept is y = n, so if n is negative, y gets shifted down rather than up.

6 0
4 years ago
36/42 = 24/r solve the proportion to find r
vivado [14]

36 \times r = 21 \times 12 \\ 36r = 252 \\ r = 252 \div36 \\ r = 7

5 0
3 years ago
Writing the quation for a line that goes through the following points (0,3) (1,1
Tomtit [17]

\huge\boxed{y=-2x+3}

Start off by finding the slope of the line with the formula \frac{y_2-y_1}{x_2-x_1}.

Substitute the values. \frac{1-3}{1-0}

Subtract. \frac{-2}{1}

Simplify. -2

-2 is the slope of the line.

Now, use the point-slope formula to create an equation, where m is the slope and (x_1, y_1) is a known point on the line. y-y_1=m(x-x_1)

Substitute the values. y-3=-2(x-0)

Simplify. y-3=-2x

Move the 3 to create the final equation in slope-intercept form. \large\boxed{y=-2x+3}

5 0
3 years ago
Someone please help i think im just over looking it
Nina [5.8K]
Answer: sen = -15; cos= 8

cot is the cotangent which is calculated by dividing cos by sen. So the dominator(15) is sen and the other number is the cos.
Notice that the number is negative which means one of them (sen or cos) is negative. We know that the angule is in the forth quadrant, and that tells us that, in that quadrant, x is a positive number while y is negative.
X is the cos function and Y is the sen. So, if y is negative, so is sen.
3 0
3 years ago
How do you change this into simplest form?
bulgar [2K]
You devide by 4 and it is 21 over 25
4 0
3 years ago
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