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3 years ago

See the picture below and answer for 50 points and brainliest

Mathematics

1 answer:

Luden [163]3 years ago

8 0

Answer:

Non-linear equations:

$y=x^2 +2x-3$

$3y=2^x$

Step-by-step explanation:

Linear equation: y = mx + b

Therefore, a linear equation has 2 variables that have no exponents.

So the non-linear equations are:

$y=x^2 +2x-3$ (this is a quadratic equation - polynomial with degree 2)

$3y=2^x$ (this is an exponential equation)

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Tracey paid $165 for an item that was originally priced at $470. What percent of the original price did Tracey pay? Round your p

solong [7]

(165/470) x 100%= 35.11%

4 0

3 years ago

A student solved for the radius of a circle with a circumference of 12π Step 1: C = 2 pi r. Step 2: 12 pi = 2 pi r. Step 3: Star

Greeley [361]

Answer:

The student made a mistake in step 4

The length of the radius should be 6 cm

Step-by-step explanation:

Let us write each step to find the radius of a circle from its circumference

Step 1:

∵ C = 2πr

∵ C = 12π

Step 2:

Equate 12π by 2πr

∴ 12π = 2πr

Step 3:

Divide both sides by 2π

∵ $\frac{12\pi }{2\pi }=\frac{2\pi r}{2\pi }$

Step 4:

∴ 6 = r

∴ The radius of the circle is 6 cm

The student mad a mistake he divided the left hand side by 2π and the right hand side by 2 only he left π with r

Step 4:

∴ 6 = πr

So he divided both sides again by π

Step 5:

∵ $\frac{6}{\pi }=\frac{\pi r}{\pi }$

Step 7:

∴ $\frac{6}{\pi }$ = r

The student made a mistake in step 4

The length of the radius should be 6 cm

3 0

3 years ago

Read 2 more answers

Help please guys if you don’t mind

dexar [7]

Answer:

slope = -2

equation y= -2x -1

y - intercept (0,-1)

5 0

3 years ago

Read 2 more answers

five times the sum of the digits of a two digit number is 9 less than the number formed by reversing its digits . if four times

TEA [102]

9514 1404 393

Answer:

Step-by-step explanation:

Let x and y represent the tens and ones digits, respectively. The 5 times the sum of digits is 5(x+y). The value of the digit-reversed number is (10y+x), so the required relation is ...

5(x +y) = (10y +x) -9

The other relationship between the digits is given as ...

4y = 1/2(10x)

A graphing calculator shows the solution to these equations is (x, y) = (4, 5).

The two-digit number is 45.

<em>Additional comment</em>

You can solve these equations in any of a variety of ways. Using a graphing calculator to find integer solutions is fast and easy, so is one of my favorites. Here, the coefficients on one equation are not easy multiples of those in the other, so substitution and/or elimination can get messy. In this situation, I like to use the "cross-multiplication" method, which starts with the equations in general form:

4x -5y +9 = 0
5x -4y +0 = 0

From the coefficients of these equations, differences of cross products are formed:

d1 = 4(-4) -(5)(-5) = 9
d2 = -5(0) -(-4)(9) = 36
d3 = 9(5) -0(4) = 45

Then the solutions are the solutions to 1/d1 = x/d2 = y/d3:

x = d2/d1 = 36/9 = 4
y= d3/d1 = 45/9 = 5

(x, y) = (4, 5) ⇒ the number is 45.

This method is one of several variations of Cramer's Rule, the general solution of systems of linear equations using matrix methods.

7 0

3 years ago

What is x? please help

kari74 [83]

<h3>Answer: x = 44</h3>

====================================================

Work Shown:

The three interior angles of any triangle always add to 180

82+54+x = 180

136+x = 180

x = 180-136

x = 44

---------------

Extra info:

If you need the value of y, then,

x+y = 180

y = 180-x

y = 180-44

y = 136

Or you could use the remote interior angle theorem to find y

y = 82+54

y = 136

The value of z is equal to y since these two angles are vertical angles.

5 0

3 years ago