Math help please? id greatly appreciate it

The perimeter of a triangle is 20 cm. If all the sides are tripled, the new perimeter will be _____ cm.

23
29
40
60
POINT VALUE: 1 points

Alyssa figured the area of a circle to be 75 mm². If its radius is doubled, the new area would be _____ mm².

100
150
300
350
POINT VALUE: 1 points

If the base of a rectangle is multiplied by 4 and its width is only multiplied by 2, then the area of the new rectangle is _____ times the size of the original.

2
4
6
8
POINT VALUE: 1 points

The perimeter of a parallelogram is 48 in. If the sides are cut in half, then the perimeter of the smaller parallelogram is _____ in.

12
24
30
36
POINT VALUE: 1 points

If the height and bases of a trapezoid are multiplied by 3, then the area of the new trapezoid is _____ times greater than the original trapezoid.

3
6
9
12
POINT VALUE: 1 points

The radius of a large circle is 8 times the radius of a smaller circle. How many times longer is the circumference of the larger circle than the smaller circle?

8 times
16 times
24 times
32 times
POINT VALUE: 1 points

The length and width of a rectangle are 17 cm and 9 cm. If the dimensions are tripled, by exactly how much has the perimeter of the rectangle increased?
(Hint: Use the Numeric Method)

26 cm
104 cm
78 cm
52 cm
POINT VALUE: 1 points

In an isosceles triangle, the two congruent legs are doubled in length while the base remains the same. How much longer is the perimeter of the new triangle?

Twice as long
Three times as long
Four times as long
Cannot be determined
POINT VALUE: 1 points

If the radius of a circle is multiplied by 5, how many times larger is the area of the new circle?
5
15
25
35
POINT VALUE: 1 points

In a parallelogram, the base is 8.2 cm and the height is 5.6 cm. If the dimensions are doubled, which expression represents the new area?

2 (8.2)(5.6)
4 (8.2)(5.6)
2 (8.2 + 5.6)
4 (8.2 + 5.6)
POINT VALUE: 1 points

1. 60
2. 300
3. 8
4. 24
5. 9
6. 8 times
7. 104 cm
8. cannot be determined
actually its: 2(congruent leg)+base/4(congruent leg)+base, but thats not an answer.
9. 25
10. 4(8.2)(5.6)

60 cm ( a+b+c ------> 3a + 3b + 3c = 3 times greater)
300 mm ( (pi*r)^2 -----> (pi*2r)^2 = four times greater)
8 times ( l*w ------> 4l*2w = 8 times)
24(1/2 the perimeter)

Now I think you really should do the rest yourself.
Just write the original formula, write the new formula, and work out the difference!

You have to be kidding! Too many questions.