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3 years ago

1)calculate please it 2) prove it please

Mathematics

1 answer:

Dvinal [7]3 years ago

4 0

1. 2sin²(-2490) + tan(1410)
2(0.25) - 0.6
0.5 + 0.6
1.1

2. $\frac{2sin(\alpha)cos(\beta) - sin(\alpha - \beta)}{cos(\alpha - \beta) - 2sin(\alpha)sin(b)} = tan(\alpha + \beta)$
   $\frac{2sin(\alpha)cos(\beta) - sin(\alpha)cos(\beta) + cos(\alpha)sin(\beta)}{cos(\alpha)cos(\beta) + sin(\alpha)sin(\beta) - sin(\alpha)sin(\beta)} = tan(\alpha + \beta)$
   $\frac{sin(\alpha)cos(\beta) + cos(\alpha)sin(\beta)}{cos(\alpha)cos(\beta) - sin(\alpha)sin(\beta)} = tan(\alpha + \beta)$
   $\frac{sin(\alpha + \beta)}{cos(\alpha + \beta)} = tan(\alpha + \beta)$
   $tan(\alpha + \beta) = tan(\alpha + \beta)$

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The surface area of a sphere is $S=4 \pi r^{2}$ where r is the radius;
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3 years ago

I'm not really looking for an exact answer, I'm more so looking for an explanation on how to do this.

marshall27 [118]

I would have each block be 1/6 of a yard

You could technically have any value you want, but for me 1/6 is easiest because 1/2 and 1/3 will scale up to this like so

1/2 = (1/2)*(3/3) = 3/6

1/3 = (1/3)*(2/2) = 2/6

The diagram below might help if you're still stuck on why I picked 1/6.

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3 years ago

The Rizzo's farm has 9 1/2 acres of corn. The Johnson's farm has 7 1/3 acres of corn. How many more acres of corn does the Rizzo

spin [16.1K]

Answer:

2 1/6

Step-by-step explanation:

9 1/2 - 7 1/3

to improper

19/2 - 22/3

= 2 1/6

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3 years ago