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AysviL [449]
3 years ago
6

Solve the system of equations 10×+7y=99andy-×=2?

Mathematics
1 answer:
djverab [1.8K]3 years ago
8 0
You can use substitution and solve y-x=2 for y which is y= x+ 2 and plug it into the y of the other equasion and you get x=5 y=7
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Estimate the product of 68 and 21
Nataly_w [17]
The product of 68 and 21 would be 1,428.
5 0
2 years ago
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The area of a rectangle is 144cm squared.if the length is 16cm. What's the perimeter?​
andreev551 [17]

Answer:

50

Step-by-step explanation:

rectangle area = 144 cm

Formula: A= L*H

The give the length which is 16

144 = 16*H

Since they gave u the area instead of the height, work backwards

144/16 = 16/16 *H

9 = H

Now you have the length and height

Length: 16

Height: 9

Perimeter is when you add up all the sides

The top and bottom of the rectangle is the length which is 16 so

16 + 16 = 32

The left and right side of the rectangle is the height which is 9 so

9 + 9 = 18

Now add then both

32 + 18 = 50

So the perimeter of the rectangle is 50

Hope this helped!

4 0
2 years ago
I need help trying to figure this out I think I have and answer but I want to make sure.
yKpoI14uk [10]

Answer:

34

Step-by-step explanation:

The mean is calculated as

mean = \frac{frequency(midpoint)}{frequency}

let x be the missing frequency, then

Total frequency × midpoint

= (16 × 2) + 7x + (20 × 12) + (10 × 17) = 32 + 7x + 240 + 170 = 442 + 7x

Total frequency = 16 + x + 20 + 10 = 46 + x, thus

\frac{242+7x}{46+x} = 8.5 ( cross- multiply )

442 + 7x = 8.5(46 + x)

442 + 7x = 391 + 8.5x ( subtract 8.5x from both sides )

442 - 1.5x = 391 ( subtract 442 from both sides )

- 1.5x = - 51 ( divide both sides by - 1.5 )

x = 34

The missing frequency is 34

3 0
3 years ago
The daily recommended allowance of calcium for a sixth grader is 1,200 mg. One cup of
ExtremeBDS [4]

Answer: one cup of milk contains 300 mg of calcium

Step-by-step explanation:

25% of 1200 is 300

8 0
3 years ago
I need help ASAP !! i’ll mark brainliest !
Andrej [43]

Answer:

192

Step-by-step explanation:

Multiply 3/4 by 256

3 0
3 years ago
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