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melisa1 [442]
4 years ago
15

Please help, kinda having a hard time with this one. I'll mark brainliest whoever answers it correctly.

Mathematics
1 answer:
Semmy [17]4 years ago
3 0

Answer:

Part A:80x+70y=150

Part B:he spends 70 minutes longer

150-80=70and70+80=150

PartC :not possible he only practices 80 minutes longer and his total time is 150,simply 150-80

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Kathy spins the spinner below 120 times. How many times is the spinner expected to land on yellow?
Marat540 [252]
Well it depended on how big or small the color parts are, you need to have  pic so we can see how big the spinner is, sorry if this is not the answer your looking for
6 0
3 years ago
A quadratic function and an exponential function are graphed below. How do the decay rates of the functions compareover the inte
Kobotan [32]

To check the decay rate, we need to check the variation in y-axis.

Since our interval is

-2We need to evaluate both function at those limits.At x = -2, we have a value of 4 for both of them, at x = 0 we have 1 for the exponential function and 0 to the quadratic function. Let's call the exponential f(x), and the quadratic g(x).[tex]\begin{gathered} f(-2)=g(-2)=4 \\ f(0)=1 \\ g(0)=0 \end{gathered}

To compare the decay rates we need to check the variation on the y-axis of both functions.

\begin{gathered} \Delta y_1=f(-2)-f(0)=4-1=3 \\ \Delta y_2=g(-2)-g(0)=4-0=4 \end{gathered}

Now, we calculate their ratio to find how they compare:

\frac{\Delta y_1}{\Delta y_2}=\frac{3}{4}

This tell us that the exponential function decays at three-fourths the rate of the quadratic function.

And this is the fourth option.

4 0
1 year ago
PLEASE SHOW YOUR WORK!!!<br><br><br><br><br><br> Solve for y: 3^3 + 14 y- (25y - 13) = y + 7y - 9y
Marina86 [1]
<h2 /><h2>⟹</h2>

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

3^3+14*y-(25*y-13)-(y+7*y-9*y)=0

Equation at the end of step 1

((3³ + 14y) - (25y - 13)) - -y = 0

Pull out like factors :

40 - 10y = -10 • (y - 4)

Equation at the end of step3:

-10 • (y - 4) = 0

STEP4:

Equations which are never true:

Solve : -10 = 0

This equation has no solution.

A a non-zero constant never equals zero.

Solving a Single Variable Equation:

Solve : y-4 = 0

Add 4 to both sides of the equation :

y = 4

<h2>y = 4</h2>

6 0
3 years ago
Students make 76.5 ounces of liquid soap for a craft fair they put the soap in 4.5 ounces bottles and sell each bottle for 5.59
liberstina [14]

Answer:

95.03

Step-by-step explanation: Divide 76.5 by 4.5

Now you have 17

Now, multiply 17 by 5.59.

Good job, these students are now successful coronavirus fighters.

8 0
4 years ago
If A = James's present age, write an expression for his age seven years from now.
ehidna [41]
<span>If A = James's present age
then
</span><span>his age seven years from now = A - 7

hope it helps</span>
3 0
3 years ago
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