What is the value of 4a3 – 2b2 + 5 when a = 3 and b = −2?
2 answers:
4a(3)-2b(2)+5
4(3)(3)-2(-2)(2)+5
12(3)-(-4)(2)+5
36-(-8)+5
44+5
49
The answer is 49.
4a3 – 2b2 + 5
= 4 * 3^3 - 2 * (-2)^2 + 5
= 4 * 27 - 2 * 4 + 5
= 96 - 8 + 5
= 93
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Ni : Zn: Cu = 7:2:9 =7x : 2x : 9x
7x+2x+9x = 3.8
18x=3.8
x=3.8/18=1.9/9≈0.21
Ni: 7x=7*0.21=1.47 ≈1.5 kg
Zn: 2x=2*0.21=0.42≈0.4 kg
Cu: 9x=9*0.21=1.89 ≈1.9 kg
Check 1.5+0.4+1.9 =3.8 True
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The answer is 185 ....................
Answer:
A) College Student
Step-by-step explanation:
D: 27.47 cm. A=b×h÷2
6.7×8.2=54.94
54.94÷2=27.47 cm
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