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2 years ago

Help me find x please

Mathematics

2 answers:

lana66690 [7]2 years ago

7 0

Answer:D

Step-by-step explanation:

Hope that helped

crimeas [40]2 years ago

7 0

Answer:

its in the balls

Step-by-step explanation:

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A ball is thrown from a height of 43 meters

AveGali [126]

When the ball will hit the ground, the height will be zero. So we need to replace $h$ with 0 in our equation, and solve for $t$ :
$0=43-4t-5t^{2}$
$-5t^{2}-4t+43=0$
To solve this equation we are going to use the quadratic formula: $t= \frac{-b(+/-) \sqrt{b^{2}-4ac} }{2a}$ .
From our height equation, we can infer that $a=-5$ , $b=-4$ , and $c=43$ . So lets replace those values in our quadratic formula to find $t$
$t= \frac{-(-4)(+/-) \sqrt{(-4)^{2}-4(-5)(43)} }{2(-5)}$
$t=- \frac{5}{8} - \frac{ \sqrt{713} }{8}$ or $t=- \frac{5}{8} + \frac{ \sqrt{713} }{8}$
$t=-3.96$ or $t=2.71$
Since time cannot be negative, $t=2.71$ is the solution of our equation.

We can conclude that the ball will hit the ground after 2.71 seconds.

4 0

2 years ago

Solve for x, given the equation Square root of x plus 9 − 4 = 1.

finlep [7]

Remember that an extraneous solution of an equation is a solution that emerges from the algebraic process of solving the equation but is not a valid solution of the equation.

First, we are going to solve our equation algebraically:

Step 1 simplify the equation:

$\sqrt{x} +9-4=1$

$\sqrt{x}+ 5=1$

Step 2 subtract 5 from both sides of the equation:

$\sqrt{x} +5-5=1-5$

$\sqrt{x} =-4$

Step 3 square both sides of the equation:

$\sqrt{x} ^2=(-4)^2$

$x=16$

Next, we are going to replace our solution in our original equation and check if it is a valid solution:

$\sqrt{x} +9-4=1$

$\sqrt{16} +5=1$

$4+5=1$

$9\neq 1$

Since 9 is not equal to 1, $x=16$ is not valid solution of the equation; therefor it is an extraneous solution.

We can conclude that the correct answer is: x = 16, solution is extraneous

8 0

2 years ago

Read 2 more answers

At eagle bay it cost $12 per hour to rent a Canoe Nate and his friends rented a canoe for 4 hours and paid $68. Write and solve

stich3 [128]

The cost to rent the canoe for 7 hours is $ 104

Solution:

At eagle bay it cost $12 per hour to rent a Canoe

Nate and his friends rented a canoe for 4 hours and paid $68

Let "x" be the number of hours rented

We can solve use the point slope equation

$y-y_1 = m(x-x_1)$

Where, "m" is the rate of change

$(x_1, y_1)$ is the sample point

From given,

m = 12

$(x_1, y_1) = (4, 68)$

Therefore,

$y - 68 = 12(x-4)$

$y - 68 = 12x -48\\\\y = 12x -48+68\\\\y = 12x + 20$

Thus the linear equation is found

Here, "y" represents the amount paid for "x" hours

Find the cost to rent the canoe for 7 hours

Substitute x = 7 in linear equation

y = 12(7) + 20

y = 84 + 20

y = 104

Thus cost to rent the canoe for 7 hours is $ 104

4 0

2 years ago

A train leaves at 08.43 and arrives at its destination at 09.23. If the train travelled 73 km, what was it's average speed in km

serg [7]

Answer: 109.5 km/ hr

Step-by-step explanation:

Distance = 73 km

Time = 40 minutes = 40/60 = 2/3 hours

Speed = Distance / time

= 73 / 2/3

= 73 x 3/2 = 219 / 2 = 109.5 km/hr

5 0

2 years ago

The rule below shows how Mrs. Rousseau's long-distance phone company computes her monthly bill. Which answer expresses that rule

Ludmilka [50]

So then n=number of long distance calls, then add the flat rate

long distance cost=number of calls times cost per clll or n times 0.42 or 0.42n
the flat rate is 24

so total is c so
c=24+0.42n

4 0

2 years ago