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ivolga24 [154]
3 years ago
10

100 points PLEASE HELP!!!

Mathematics
1 answer:
soldi70 [24.7K]3 years ago
4 0

Answer:

C. −0.4, −0.4545454545

Step-by-step explanation:

between −1/2 and −1/3 so it is bet. -0.5 n -0.3333333333333333

only correct ans is C. −0.4, −0.4545454545

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The area of the cross section of a sphere at the largest point is 100π square miles. what is the total surface area of this sphe
Firlakuza [10]

The cross-section of a sphere  is a circle . The  area of a circle can be calculated by the formula A= \pi\r^{2} Where r is the radius of the circle.

Given :\pir^{2}   = 100\pi

Solving for r we have:

r^{2} = \frac{100\pi }{\pi}=   100

Or r= 10.

The area of a sphere is calculated by the formula :

SA = 4\pi  R^{2}

Substituting r value we have:

SA= 4\pi\ 10 ^{2}    = 400\pi

The total surface area of this sphere is 400π .

4 0
3 years ago
A submarine drops 3 feet every minute. If it started at sea level, which integer could represent the submarine's location after
irina [24]

Answer:

The submarine should be at 15 feet is it continued to drop 3 feet every minute at a continuous rate.

Step-by-step explanation:

3 x 5 = 15 (ft.)

4 0
3 years ago
On Monday morning, a bakery had 150 pounds of raisins in stock. By evening that day, their supply of raisins was reduced to 120
lawyer [7]

Answer:

20%

Step-by-step explanation:

150 and 120 have a difference of 30

30 ÷ 150

.2 then multiply by 100

20 there is your answer

Hope this helped :)

7 0
2 years ago
Ruth wants to buy a skateboard for $56. She has $90 in her account. She spent $11.65 to buy stationary. She also wants to buy so
nevsk [136]
The answer is the second one I dont have that symbol on my keyboard but it’s the second answer on the multi choice
90-11.65-56=22.35
divide that by 3.72 u get 6 so she can only get six comics or any whole positive number lower than that. Therefore it’s #2
5 0
2 years ago
Read 2 more answers
1. Consider the right triangle ABC given below.
lbvjy [14]
#1) 
A) b = 10.57
B) a = 22.66; the different methods are shown below.
#2)
A) Let a = the side opposite the 15° angle; a = 1.35.
Let B = the angle opposite the side marked 4; m∠B = 50.07°.
Let C = the angle opposite the side marked 3; m∠C = 114.93°.
B) b = 10.77
m∠A = 83°
a = 15.11

Explanation
#1)
A) We know that the sine ratio is opposite/hypotenuse.  The side opposite the 25° angle is b, and the hypotenuse is 25:
sin 25 = b/25

Multiply both sides by 25:
25*sin 25 = (b/25)*25
25*sin 25 = b
10.57 = b

B) The first way we can find a is using the Pythagorean theorem.  In Part A above, we found the length of b, the other leg of the triangle, and we know the measure of the hypotenuse:
a²+(10.57)² = 25²
a²+111.7249 = 625

Subtract 111.7249 from both sides:
a²+111.7249 - 111.7249 = 625 - 111.7249
a² = 513.2751

Take the square root of both sides:
√a² = √513.2751
a = 22.66

The second way is using the cosine ratio, adjacent/hypotenuse.  Side a is adjacent to the 25° angle, and the hypotenuse is 25:
cos 25 = a/25

Multiply both sides by 25:
25*cos 25 = (a/25)*25
25*cos 25 = a
22.66 = a

The third way is using the other angle.  First, find the measure of angle A by subtracting the other two angles from 180:
m∠A = 180-(90+25) = 180-115 = 65°

Side a is opposite ∠A; opposite/hypotenuse is the sine ratio:
a/25 = sin 65

Multiply both sides by 25:
(a/25)*25 = 25*sin 65
a = 25*sin 65
a = 22.66

#2)
A) Let side a be the one across from the 15° angle.  This would make the 15° angle ∠A.  We will define b as the side marked 4 and c as the side marked 3.  We will use the law of cosines:
a² = b²+c²-2bc cos A
a² = 4²+3²-2(4)(3)cos 15
a² = 16+9-24cos 15
a² = 25-24cos 15
a² = 1.82

Take the square root of both sides:
√a² = √1.82
a = 1.35

Use the law of sines to find m∠B:
sin A/a = sin B/b
sin 15/1.35 = sin B/4

Cross multiply:
4*sin 15 = 1.35*sin B

Divide both sides by 1.35:
(4*sin 15)/1.35 = (1.35*sin B)/1.35
(4*sin 15)/1.35 = sin B

Take the inverse sine of both sides:
sin⁻¹((4*sin 15)/1.35) = sin⁻¹(sin B)
50.07 = B

Subtract both known angles from 180 to find m∠C:
180-(15+50.07) = 180-65.07 = 114.93°

B)  Use the law of sines to find side b:
sin C/c = sin B/b
sin 52/12 = sin 45/b

Cross multiply:
b*sin 52 = 12*sin 45

Divide both sides by sin 52:
(b*sin 52)/(sin 52) = (12*sin 45)/(sin 52)
b = 10.77

Find m∠A by subtracting both known angles from 180:
180-(52+45) = 180-97 = 83°

Use the law of sines to find side a:
sin C/c = sin A/a
sin 52/12 = sin 83/a

Cross multiply:
a*sin 52 = 12*sin 83

Divide both sides by sin 52:
(a*sin 52)/(sin 52) = (12*sin 83)/(sin 52)
a = 15.11
3 0
3 years ago
Read 2 more answers
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