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Stolb23 [73]
3 years ago
15

(1.3t3 + 0.4t2 – 24t) – (0.6t2 + 8 – 18t)

Mathematics
1 answer:
lorasvet [3.4K]3 years ago
5 0
To solve this problem you must apply the proccedure shown below:
 1. You have that the the polynomial being subtracted is 0.6t²+8-18t, therefore, <span> to find the additive inverse of the polynomial, you must multiply it by -1, as following:
 </span>(0.6t²+8-18t)
 (-1)(0.6t²+8-18t)
 2. Therefore, you obtain the following result:
 -0.6t²-8+18t
 Then, tas you can see, the  answer is -0.6t²-8+18t.
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Evaluate the expression. r = , v = , w = v ⋅ w
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Answer:

v . w= -13

Step-by-step explanation:

Evaluate the expression: v ⋅ w Given the vectors: r = <8, 1, -6>; v = <6, 7, -3>; w = <-7, 5, 2>

Solution

Given the vectors:

r = <8, 1, -6>

v = <6, 7, -3>

w = <-7, 5, 2>

If you're asking about the dot product.

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v.w = (6*-7) + (7*5) + (-3*2)

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How many pounds of a 23% zinc alloy must be mixed with a 42% zinc alloy to make 516 pounds of a 37.25% zinc alloy?
nydimaria [60]

Answer:

(A)129 Pounds

Step-by-step explanation:

Let x be the number of 23% zink alloy

Therefore:

Since the total result is 516 pounds

The number of pounds of 42% zink alloy =516-x pounds

We then have the resulting equation:

0.23x+0.42(516-x)=0.3725*516

0.23x+216.72-0.42x=192.21

Colect like terms

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Therefore, the number of pounds of 23% zink alloy that must be mixed is 129 pounds.

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