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Kaylis [27]
4 years ago
12

Solving linear system, substitution 20x-30y=-50 x+2y=1 HELP PLEASE

Mathematics
1 answer:
hjlf4 years ago
6 0
20x -  30y = -50 ⇒ 20x -  30y = -50
    x +   2y = -1   ⇒ <u>20x + 40y = -20</u>
                                       <u>-70y</u> = <u>-30</u>
                                        -70     -70
                                            y = ³/₇
                           20x - 30(³/₇) = -50
                             20x - 12⁶/₇ = -50
                             <u>      + 12⁶/₇  + 12⁶/₇
</u>                                        <u>20x</u> = <u>47¹/₇
</u>                                         20<u />       20<u>
</u>                                            x = 2⁷/₂₀
                                      (x, y) = (2⁷/₂₀, ³/₇)
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Suppose you invest $1,600 at an annual interest rate of 4.6% compounded continuously how much will you have in the account after
DanielleElmas [232]
Total = Principal * e^(rate*years)
where "e" is the mathematical constant 2.71828182828459
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Total = 1,600 * 2.71828182828459^(.184)
Total = 1,600 * <span> <span> <span> 1.2020158231 </span> </span> </span>
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Source:
http://www.1728.org/rate2.htm





8 0
3 years ago
Which line shows theINITIAL error in volume work?
aliina [53]

In step 2, V = \frac{4}{3}(3.14)(37.5) show the error in volume work.

Solution:

Given data:

The steps shows it is sphere.

Radius of the sphere = 12.5

The value of π = 3.14

Volume of the sphere = \frac{4}{3} \pi r^3

Step 1:

$V=\frac{4}{3} (3.14)(12.5)^3

$V=\frac{4}{3} (3.14)(12.5)(12.5)(12.5)

Step 2:

$V=\frac{4}{3} (3.14)(1953.125)

Step 3:

$V=\frac{4}{3} (6132.81)

Step 4:

V = 8177.08 cubic units

This is the correct solution.

But in the given options, in step 2, 12.5 is multiplied by 3.

That is not the correct step. You have to do 12.5 × 12.5 × 12.5.

Hence in step 2, V = \frac{4}{3}(3.14)(37.5) show the error in volume work.

7 0
3 years ago
Please help me !!! :))))
jonny [76]

Answer:

12.4 in

Step-by-step explanation:

I whish i can help :)

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3 years ago
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Nezavi [6.7K]
Answer first number  = 57  second number = 41
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x= 16+y
x = 16+41
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3 years ago
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