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3 years ago

Someone please help! i need this answer!

Mathematics

2 answers:

Ilya [14]3 years ago

8 0

Answer:

Step-by-step explanation:

Katyanochek1 [597]3 years ago

6 0

Answer:

(b)

Step-by-step explanation:

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Sam paid $8.28 for 18 stamps. At this rate, how much would it cost Sam to buy 12 stamps?

11Alexandr11 [23.1K]

Answer: $5.52

Step-by-step explanation:

Given: Sam paid $8.28 for 18 stamps.

Thus, the cost of 18 stamps = $8.28

Then the cost of 1 stamp=

Thus, the cost of 1 stamp=$0.46

With the same rate , the cost of 12 stamps=

Therefore, the cost of 12 stamps= $5.52

hence, it costs $5.52 to Sam to buy 12 stamps.

4 0

3 years ago

Read 2 more answers

F(x) = 3x + 10, g(x) = x - 2, Find g(f(x))

ElenaW [278]

Answer with step-by-step explanation:

If g(x) = x - 2, then g(f(x)) = f(x) - 2. So the whole equation would be: 3x + 10 × x - 2. Simplified: g(f(x)) = 13x - 2

Hope this helped!

4 0

4 years ago

Given the equation y − 3 = one half(x + 6) in point-slope form, identify the equation of the same line in standard form.

Schach [20]

Answer:

A. $x-2y=-12$

Step-by-step explanation:

We have been given an equation of a line in point-slope form. We are asked to write our given equation in standard form.

$y-3=\frac{1}{2}(x+6)$

Since we know that standard form of equation is: $ax+by=c$ , where, a, b and c are constants.

Let us multiply both sides of our given equation by 2.

$(y-3)*2=2*\frac{1}{2}(x+6)$

$2y-6=x+6$

Let us add 6 to both sides of our equation.

$2y-6+6=x+6+6$

$2y=x+12$

Let us subtract x from both sides of our equation.

$2y-x=x-x+12$

$2y-x=12$

Multiply both sides of our equation by -1.

$-2y+x=-12$

Rearranging our equation we will get,

$x-2y=-12$

Therefore, the standard form of our given equation is $x-2y=-12$ and option A is the correct choice.

4 0

3 years ago

Patricia has $101.45 in her savings account . Her uncle has 10 ^ 2 much money in his savings account. How much does her uncle ha

pickupchik [31]

Answer:

Her uncle has $10145 in has account

Step-by-step explanation:

You just have to move the period 2 spaces to the right -->

6 0

3 years ago

Jean runs 8 mi and then rides 11 mi on her bicycle on a biathlon. She rides 9 mph faster than she runs. If the total time for he

Ipatiy [6.2K]

Let Jean's speed while running = x mph

Then Jean's speed while riding will be = x+9 mph

Distance covered by running = 8 miles

Distance covered by riding = 11 miles

Total time taken to complete the race = 1.5 hours

As, $time=\frac{distance}{speed}$

So, time for running= $\frac{8}{x}$

And time for riding= $\frac{11}{x+9}$

Equation becomes:

$\frac{8}{x}+\frac{11}{x+9}=1.5$

Now, multiply every term by 2x(x+9) to clear denominators:

$16(x+9)+22x=3x(x+9)$

Simplifying it we get

$3x^{2}-11x-144=0$

Solve the quadratic equation using formula

$x= \frac{-b+\sqrt{b^{2}-4ac }}{2a}$

putting a=3 , b= -11, c= -144

we get (x - 9)(3x + 16) = 0

where x=9 and x= $\frac{-16}{3}$

Neglect the negative answer as speed cannot be negative, so x = 9 mph

Hence, Jean's running speed is 9 mph and riding speed is x+9 = 9+9 = 18 mph

4 0

4 years ago