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enot [183]
3 years ago
8

4 (2x + 1) — 5х + 3x +9

Mathematics
1 answer:
PilotLPTM [1.2K]3 years ago
4 0
I think it’s number b. But I’m not sure
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Solve the equation 2sin x cos x = cos x, for 0° < x≤ 90°​
lilavasa [31]

Answer:

2sinx.Cosx=cosx

2sin90°.cos90°=cos90°

2×1.0=0

0=0

4 0
3 years ago
A student says that 2 1/4 + 1 2/4 =5. Why is that answer wrong?
saw5 [17]
2 1/4 + 1 2/4 ≠ 5

Why?

2 1/4 + 1 2/4 
=3 3/4

The answer is wrong because the student added wrong. The real answer is 3 3/4.
8 0
4 years ago
If P(3,2) and Q(7,10) are the endpoints of the diameter of a circle, what is the area of the circle in square units?
eimsori [14]

the diamiter is the two out side numbers minused by 3.14

4 0
3 years ago
The ratio of the side lengths of a quadrilateral is 3:2:6:7, and its perimeter is 126 meters. What is the length of the shortest
scoundrel [369]

since the lengths of all those four sides are in a 3:2:6:7 ratio, and the whole perimeter is 126, what we do is, simply divide the whole by (3+2+6+7) and distribute accordingly.


\bf \stackrel{3\cdot \frac{126}{3+2+6+7}}{3}~~:~~\stackrel{2\cdot \frac{126}{3+2+6+7}}{2}~~:~~\stackrel{6\cdot \frac{126}{3+2+6+7}}{6}~~:~~\stackrel{7\cdot \frac{126}{3+2+6+7}}{7} \\\\\\ 3\cdot \cfrac{126}{18}~~:~~2\cdot \cfrac{126}{18}~~:~~6\cdot \cfrac{126}{18}~~:~~7\cdot \cfrac{126}{18} \\\\\\ 21~~:~~\stackrel{shortest}{14}~~:~~42~~:~~49

7 0
3 years ago
Julie says ‘ I added three odd numbers and my answer was 50’ explainwhy Julie is incorrect
Dvinal [7]
Odd + odd = even +  odd = odd

 adding 3 odd numbers would make an odd answer

7 0
4 years ago
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