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bagirrra123 [75]
2 years ago
7

X+2y=19 and x+y=13 in substitution methood​

Mathematics
1 answer:
densk [106]2 years ago
3 0
X=7, y=6. that’s your answer!
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I dont get this please help
Viktor [21]

Step-by-step explanation:

the side lengths of the base (the ground triangle) are equal. that means every ground side length is 8 in.

and that also makes the 3 triangles of the side areas of the pyramid equal.

so, for the surface area of the pyramid we need to calculate the area of one side area triangle, multiply it by 3 (as we have 3 side areas) and add the area of the ground triangle.

the area of a triangle is

baseline × height / 2

so, for a side area triangle we get

8 × 14 / 2 = 8×7 = 56 in²

all 3 side areas together are then

3×56 = 168 in²

the ground area triangle is then

8 × 6.9 / 2 = 4 × 6.9 = 27.6 in²

so, the total surface area of the pyramid is

168 + 27.6 = 195.6 in²

4 0
2 years ago
Estimate 196 and 482
geniusboy [140]
When you estimate you round to the nearest whole number (simply to make it easier.) Depending on what place you need to estimate to (like hundreds, or just tens..)

Let's turn 196 into 200 and 482 into 480

200+480 = 680

Hope this hlps!
3 0
3 years ago
Read 2 more answers
An ore is 0.75% pure gold. How many kilograms of gold are in 500 kg of ore?
frozen [14]
0.75 x 500 is 375 of gold in 500 kg of ore
8 0
3 years ago
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Eleven members of the Middle School Math Club each paid the same amount for a guest speaker to talk about problem solving at the
tiny-mole [99]
The missing digit is number 3. The total amount should be $132

I multiplied 11 by the numbers 10 and above to get the possible three digit answer who has 1 as the first digit and 2 as the last digit.

11 x 10 = 110
11 x 11 = 121
11 x 12 = 132

The 11 members of the Middle School Math club each paid $12 for a guest speaker.
7 0
2 years ago
24 pencils costing a total of $3.00 how many cents per a pencil
hram777 [196]

Answer:

$0.125 , so 12.5 cents per pencil

Step-by-step explanation:

\frac{3.00}{24}

You can double check this by doing 0.125*24 , making sure it equals 3.

3 0
3 years ago
Read 2 more answers
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