Pleaseeeee helppp!!!!!!!!!!!

Answers

Answer 1

Answer: $4^(2x)=7^(x-1)\n16^x=7^x\cdot7^(-1)\n(16^x)/(7^x)=(1)/(7)\n\left((16)/(7)\right)^x=(1)/(7)\nx=\log_{\tfrac{16}{7}}(1)/(7)\approx-2.35389$

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(a) 3x + 7y = 13, 5x + 2y = 12
How do i solve this linear equation using substitution method??

Answers

Answer:

x= 2, y= 1

Step-by-step explanation:

First label the 2 equations:

3x +7y= 13 -----(1)

5x +2y= 12 -----(2)

Make x or y the subject of formula for one of the equation so that we can substitute its value into the 2nd equation.

Here, I am making y the subject of formula in the 2nd equation.

5x +2y= 12

2y= 12 -5x

$y = 6 - (5)/(2) x$ -----(3)

Substitute (3) into (1):

$3x + 7(6 - (5)/(2) x) = 13$

Expand:

$3x + 42 - (35)/(2) x = 13$

Bringconstantstooneside:

$3x - (35)/(2) x = 13 - 42$

Simplify:

$- (29)/(2) x = - 29$

Multiplyby-2onbothsides:

$- 29x = - 58$

Divideby-29onbothsides:

x=2

Substitute x=2 into (1):

3(2) +7y= 13

7y +6= 13

7y= 13 -6 (-6onbothsides)

7y= 7

y= 7 ÷7

y= 1

Unsaved Find the surface area of a conical grain storage tank that has a height of 46 meters and a diameter of 16 meters. Round the answer to the nearest square meter.

Answers

The formula for the surface area of a cone is $SA= \pi r(r+ √(h^2+r^2) )$ . Filling in accordingly, we have $SA= \pi (8)(8+ √(46^2+8^2) )$ and $SA=8 \pi (8+ √(2116+64))$ . That will simplify to $SA=8 \pi (8+ √(2180) )$ and $SA=8 \pi (8+46.69047)$ . If we LEAVE pi in the answer you would have $437.5 \pi$ which rounds to $438 \pi$ . If you multiply pi in, you would have 1375.5 or, rounded, 1376. Of course those labels are all meters squared.

What is the value of the expression 9×4−(2×12)? Enter your answer in the box.

Answers

Answer:

Step-by-step explanation:

9x4-(2x12)

= 36-24

= 12

The force of an object (f) is equal to its mass (m) times its acceleration (a). Thus, the formula for calculating force is f = ma. Based on this information, which of the following equations would be used to calculate acceleration?A. a = f ÷ m
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D. a = fm

Answers

The correct answer is A. To rearrange the equation, you have to divide both sides by "m" to isolate "a" so that acceleration can be directly calculated. This would result in the equation becoming: f/m = ma/m As the mass (m) on the right hand side of the equation appears in the numerator and the denominator, it can be cancelled, resulting in the new equation: f/m = a which can then be flipped to give a = f/m.

Tom bought 2 1/16 pounds of peanuts and 2.45 pounds of cashews. Which did he buy more of?Explain.

Answers

2.45 pounds is more because that equals to a little over .40% more than 1/16 as a fraction which would be more over to the right making it a smaller digit

A political action group wants to poll voters in theirarea. Of the 25 towns in their area, they randomly select
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Answers

Answer:

Step-by-step explanation:

they are simple way to vote

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