Which is a perfect square? 20 21 24 25

2 answers:

4 0

You can find a perfect square when that number can be square rooted and the result is a whole number. So, the square root of 20 is approximately 4.47; the square root of 21 is approximately 4.58; the square root of 24 is approximately 4.90. The square root of 25 is 5 - a whole number. $\sqrt{25} = 5$

Radda [10]3 years ago

3 0

25 is a perfect square

5 x 5 = 25

hope this helps

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What is the slope of the line that passes through (3,-7) and (-1,1)

Anna [14]

Answer:

-2

Step-by-step explanation:

slope formula is (y2-y1)/(x2-x1)

1 - -7 / -1 - 3

8 / -4

-2

5 0

3 years ago

Martin has a total of 19 nickels (50.05) and dimes ($0.10) worth $1.65. How many of each type of coin does he have?

mezya [45]

Answer: 19nickels and 7dimes.

Ps i really don’t know where the 50.05 came from if it is suppose to be there then I really don’t know how to solve this.

Step-by-step explanation:

Ok so if you know that there are 19nickels, let n=number of nickels.

The number of total coins subtracted by number of nickels will give you number of dimes.

165-number of nickels=number of dimes

Value of dimes=10(number of dimes) or total value of dimes/individual value (10cent)

Then you can substitute total as $1.65 and get the value of nickels by multiplying by 5cent ( my teacher taught me using whole numbers to make it easier so I turned $1.65 to 165 cent). Since the value of the dimes is the value of nickels subtracted from the total, I can subtract 95 from 165 and divide the difference by 10, to get the number of dimes.

5(n)=5(19)=95

(165-95)/10=number of dimes

70/10=7dimes

You can check by multiplying 7x10 and 5x15 again and adding them together to see if they equal 165 cent.

4 0

3 years ago

Can somebody help please??<br> urgently

VMariaS [17]

The perimeter of the shaded part is 3.93 cm.

Step-by-step explanation:

Step 1; The perimeter of a circle is calculated by multiply 2π with the radius. This given circle is not an entire circle. An entire circle has an angle if 360° while this has an angle of 50°. So we divide 360° with 50°.

Number of these shapes to form a full circle = 360° / 50° = 7.2. So 7.2 of these shapes will need to be combined to form a full circle. So we can calculate the perimeters of full circles and then divide it by 7.2 to get the parameters of the given sections.

Step 2; The parameter and circumference of a circle are equal. So

The perimeter of shaded region = Perimeter of the entire region - Perimeter of the unshaded region.

The Perimeter of circle with radius 8cm = 2π × 8 = 50.2654 cm.

The perimeter of the given shape = $\frac{50.265}{7.2}$ = 6.9813 cm