X/40 = 7/20
40/20=2
x=7x2=14
14 red marbles
Hope this helps.
Answer:
the given identity is true.
Step-by-step explanation:
this identity may be verified using several ways, the simpliest is:
1-sin^2xcot^2x=sin^2x;
![1-sin^2x*\frac{cos^2x}{sin^2x}=sin^2x;](https://tex.z-dn.net/?f=1-sin%5E2x%2A%5Cfrac%7Bcos%5E2x%7D%7Bsin%5E2x%7D%3Dsin%5E2x%3B)
1-cos^2 x=sin^2 x;
sin^2 x= sin^2 x.
Answer:
What is the area? 266 square inches
Step-by-step explanation:
the area = 19 × 14
the area = 266 square inches
Answer:
1 / X² -4 = (- 1/4) / (X+2) + (1/4) / (X - 2)
Step-by-step explanation:
1 / x²-4 = 1 / (X+2) * (X-2)
1 / X²-4 = (A / X+2) + (B / X-2) = (AX - 2A + BX +2B) / X² -4
∴ 1 = (A + B) * X - 2 (A - B)
A + B = 0
- 2 (A - B) = 1
A - B = - 1/2
∴ 2A = - 1/2
A= - 1/4
B= 1/4
1 / X² -4 = (- 1/4) / (X+2) + (1/4) / (X - 2)
Answer:
A) 30x+32=560
Step-by-step explanation:
Since mikey has already read 32 pages last week and would read 30pages per hour, then in order to get 560
You do:
32(pages)+30(pages*hour)*x(hours) =560 pages.