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sasho [114]
2 years ago
6

Evaluate the expression when b= 3 and c = -4 b - 4c ​

Mathematics
1 answer:
Sedaia [141]2 years ago
5 0

Answer:

15.

c is a negative

3 - (-12)

15

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The axis of the sphere below is 16 units in length. What is the surface area of the sphere?.
Nataly_w [17]
There are enough information's already given in the question. Based on those information's that answer can be easily deduced.
Radius of the sphere = 8 units
Then
Surface area of the sphere = 4 *pi * r^2
                                            = 4 * pi * (8)^2
                                            = 4 * pi * 64
                                            = 256pi
I hope that this answer has come to your help.
5 0
3 years ago
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How to round to the nearest hundred
Andrews [41]
If it is less then 5 you do the next hundred down 5 and above the next one up
8 0
3 years ago
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6(x + 3) − 3 = 39 whats the solution of x?
Naily [24]

Answer:

x = 4

Step-by-step explanation:

6(x+3)-3= 39

6x+18-3 =39

6x+15 =39

   -15   -15

6x= 24

/6     /6

x=4

4 0
3 years ago
Read 2 more answers
A spinner for a board game consists of a cardboard circle with two plastic arrows anchored to its center. The arrows are congrue
tekilochka [14]

Answer:

Option (c) is correct.

The approximate total area of the plastic triangles on the spinner is 2 × 3.9 square centimeters = 7.7 square centimeters


Step-by-step explanation:

Given:A spinner for a board game consists of a cardboard circle with two plastic arrows anchored to its center. The arrows are congruent isosceles triangles connected at their bases.

also,  Given: The base of each triangle measures 2 centimeters and the perimeter of each triangle is 10 centimeters.

We have to find the approximate total area of the plastic triangles on the spinner.

Perimeter of triangle is the sum of sides.

Since given the triangle to be isosceles .

Let the two equal side be x cm, then,

Perimeter of given triangle = 1 0

⇒ x  + x + 2 = 1 0

⇒ 2x = 8

⇒ x = 4

Thus, side of triangle is 4 cm.

Now we find the area of  isosceles triangle.

We first find the height, using Pythagoras theorem,

(AC)^2=(AD)^2+(DC)^2

Putting values, we get,

(4)^2=(AD)^2+(1)^2

Solving we get,

AD=3.87

Thus, area of one isosceles triangle  A=\frac{1}{2} bh

area of one isosceles triangle  A=\frac{1}{2} \times 2 \times 3.87

On solving we get,

Approximate area of one plastic triangles on the spinner is 3.9 square centimeters.

Thus, the approximate total area of the plastic triangles on the spinner is 2 × 3.9 square centimeters = 7.7 square centimeters

Option (c) is correct.




7 0
3 years ago
Read 2 more answers
5) 10r2 + 3 = 813<br><br>how do I solve by square roots ​
kodGreya [7K]

10r² + 3 = 813

10r² = 813 - 3

10r² = 810

r² = 810 ÷ 10

r² = 81

r = √81

r = <u>9</u>

So, the value of <em>r </em>is 9

<em>Hope </em><em>it </em><em>helpful </em><em>and </em><em>useful </em><em>:</em><em>)</em>

7 0
3 years ago
Read 2 more answers
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