Answer:

Step-by-step explanation:
Complete question

Required
Solve for x
We have:

Collect like terms

Multiply through by 

Make x the subject

5=4x+2x-7
5+7=6x
12=6x
12/6=6x/6
2=x
Tasha's mistake is in Step 4
she has a negative sign in front of the fraction and she has a negative exponent on the 4 in the denominator
Answer: 86.5 in²
Step-by-step explanation: Circumference is2·pi·r= 32.97 in.
Radius r = 32.97 in/ 2pi = 5.247 in. Area is pi·r²
Answer:
Step-by-step explanation:
11C4 = 11! / (7!*4!) = 11 * 10 * 9 * 8 * 7!/ 7! * 4!
11C4 = 11*10 * 9 * 8 / 24
11C4 = 11*10 * 3
11C4 = 330
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You can't do the second one. Permutations and Combinations always give an answer greater than 1 and integers.