Answer:
1,100
Step-by-step explanation:
2/5 of the students is equivalent to 394 students. The total number of students involved is thus 394*5/2.
Answer:
see explanation
Step-by-step explanation:
Using the addition identity for sine
sin(x + y) = sinxcosy - cosxsiny
Consider the left side
cos²(45 - A) - sin²(45 - A)
cos²(45 - A) = 1 - sin²(45 - A), thus
1 - sin²(45 - A) - sin²(45 - A)
= 1 - 2sin²(45 - A) ← expand sin(45 - A)
= 1 - 2(sin45cosA - cos45sinA)²
= 1 - 2(cosA - sinA)²
= 1 - 2(cos²A - sinAcosA + sin²A)
= 1 - cos²A + 2sinAcosA - sin²A
= sin²A + 2sinAcosA - sin²A
= 2sinAcosA
= sin2A = right side ⇒ verified
Its the fourth one hope this helps
Answer:
X/2 = 61.2
X=122.4
Step-by-step explanation:
Ok so we know that a number was halved so we can use x and equaled to 61.2 so we can do x/2 = 61.2