PLS MATHS EXPERT PLS ANSWER ASAP I AM GIVING OUT ALL MY POINTS
Q4: There are two cylinders. The first is of radius 7 and height 4 and the second is of radius 6 and height 7. Which cylinder has the larger surface area?
A. the second cylinder
B. the first cylinder

Q5: Find the surface area of a cylinder whose base is a circle of radius 21 cm and whose height is 9 cm. Use
=22/7

Q6: Hannah and Michael were calculating the surface area of a cylinder of height 28 and radius 9. Hannah found the surface area to be
180
,and Michael found it to be 666
.Who is correct?
A. Hannah
B. Michael

Q4: A. the second cylinder

Q5:

Q6: B. Michael

Step-by-step explanation:

Q4:

Cylinders:

- The first is of radius 7 and height 4

- The second is of radius 6 and height 7

Cylinder 1:

Cylinder 2:

Q5:

Cylinder:

Radius = 21 cm

Height = 9 cm

Q6:

Cylinder of height 28 and radius 9.

Michael is correct.

4. A

5. 3960 cm²

6. B

Step-by-step explanation:

#4. The surface area of a cylinder is denoted by: A = 2πr² + 2πrh, where r is the radius and h is the height. Plug the given values for the two cylinders in:

1st cylinder: A = 2πr² + 2πrh = 2π * 7² + 2π *  7 * 4 = 154π

2nd cylinder: A = 2πr² + 2πrh = 2π * 6² + 2π * 6 * 7 = 156π

So, the second cylinder has the larger surface area: A.

#5. Use the area equation again here: A = 2πr² + 2πrh.

The radius is 21 and the height is 9, so:

A = 2πr² + 2πrh

A = 2 * (22/7) * 21² + 2 * (22/7) * 21 * 9 = 3960 cm²

#6. Use the area equation again here: A = 2πr² + 2πrh.

The radius is 9 and the height is 28, so:

A = 2πr² + 2πrh

A = 2π * 9² + 2π * 9 * 28 = 666π

Thus, Michael is correct: B.

c

-by-step explanation:

it would be c

answer:   expression= p+p*d%

price reduction + sale price = $625

sale price: $p+$p*d%

where d% is the percentage of discount

step-by-step explanation:

original price = p

price went down by $150 price reduction $p*d%

sale price= $ 475

therefore the price before sale is: $625

and the expression that shows the price before sale is: p+p*d%