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alexandr402 [8]
3 years ago
14

A sphere has diameter 28 cm. If the diameter is divided by 2, what is the effect on the surface area?

Mathematics
1 answer:
spayn [35]3 years ago
4 0

Answer:

The surface area is divided by 4.

Step-by-step explanation:

Surface area of a sphere is 4πr².

When the diameter is 28 the radius is 14. So: 4π(14)² = 784π

If you cut the diameter in half you get 14. The radius is now 7.

4π(7)² = 196π.

784/4 = 196 so divided by 4.

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Bags of almonds cost three dollars more than bags of pecans the owner of a bakery ordered five bags of almonds and three bags of
antiseptic1488 [7]

Answer:

Let bags of pecans cost = x

Make an equation :

Bags of almonds cost = x + 3 (they said almonds cost 3 dollars more)

Total number of bags ordered: (3 bags pecans) + (5 bags of almonds)

Cost for pecans = 3x

Cost for almonds = 5(x + 3) = 5x + 15

Price of pecans + price of almonds = total cost

Solve for x:

3x + 5(x + 3) = 55 (remove brackets)

3x + 5x + 15 = 55 (add like terms)

8x + 15 = 55

8x + 15 - 15 = 55 - 15 (get rid of the 15)

8x = 40

8x/8 = 40/8

x = 5

bags pecans cost is $5

bags of almonds is $5+$3 = $8

6 0
3 years ago
61. A survey asked students what classes they
IRISSAK [1]

Answer:

63 students.

Step-by-step explanation:

x students.

34 have science 28 have math 5 math and science 6 neither.

6 neither means there were at least 6 students so our number goes up to 6 students.

34 have science 28 have math 5 have both.

34-5 and 28-5

29 and 23

29+23 is 52 +5 is 57 +6 is 63.

63 students.

HOpe this helps!

Merry Christmas!

4 0
3 years ago
Read 2 more answers
The points A(4,0), B(4,4), C (0,4) and D (0,0) form a square. Find the slopes of BD and AC. What does your results say about the
Solnce55 [7]

Answer:

Step-by-step explanation:

7 0
4 years ago
How do I find the correct y intercept and maximum point? Plz show how you got the answer.
masha68 [24]

Answer:

(0, 4)

Step-by-step explanation:

Look carefully at the y-axis.  What is the y-coordinate where the curve crosses the y-axis?  It's y = 4.  Thus, the y-intercept is (0, 4).

It just so happens that (0, 4) is also the maximum of the function represented here.

8 0
4 years ago
Write the number in the form a+bi square root of -64+2?
Igoryamba

Answer:

\sqrt{-64}+2=2+8i

Step-by-step explanation:

i=\sqrt{-1}\\\\\sqrt{-64}=\sqrt{(64)(-1)}\qquad\text{use}\ \sqrt{ab}=\sqrt{a}\cdot\sqrt{b}\ for\ a\geq0\ and\ b\geq0\\\\=\sqrt{64}\cdot\sqrt{-1}=8\cdot i=8i\\\\\text{Therefore:}\\\\\sqrt{-64}+2=8i+2=2+8i

5 0
3 years ago
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