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Dominik [7]
3 years ago
9

Help me on all of the questions below plz

Mathematics
1 answer:
Lubov Fominskaja [6]3 years ago
7 0
1- The answer is that she wants the new time to be 32 minutes

Solution: The question asks that she wants to DECREASE by 20%

What you will do it convert 20% to a decimal (which is 0.20)

Then, you need to multiply the minutes by the decimal:

40 x 0.20 = 8 minutes

Now you know that 8 minutes will be 20% of 40 minutes, so you just subtract 8 from 40 UwU
You might be interested in
Show whether or not y=x+3 is tangential to the curve y^2=x​
wolverine [178]

The line y = x + 3 has slope 1, so we look for points on the curve where the tangent line, whose slope is dy/dx, is equal to 1.

y² = x

Take the derivative of both sides with respect to x, assuming y = y(x) :

2y dy/dx = 1

dy/dx = 1/(2y)

Solve for y when dy/dx = 1 :

1 = 1/(2y)

2y = 1

y = 1/2

When y = 1/2, we have x = y² = (1/2)² = 1/4. However, for the given line, when y = 1/2, we have x = y - 3 = 1/2 - 3 = -5/2.

This means the line y = x + 3 is not a tangent to the curve y² = x. In fact, the line never even touches y² = x :

x = y²   ⇒   y = y² + 3   ⇒   y² - y + 3 = 0

has no real solution for y.

3 0
2 years ago
There are 40 runners in a race. How many ways can the runners finish​ first, second, and​ third?
k0ka [10]

Answer:

117600

Step-by-step explanation:

50 x 49 x 48 = 117,600 ways

You have 50 possible for 1st, 49 for 2nd, 48 for 3rd

or

Permutations 50P3 = 117,600

5 0
3 years ago
Write the equation for nancy started the year with $425 in the bank and is saving $25 a week. sam started with $875 and is spend
Zina [86]
X is the amount of weeks.
Equation: 425+25x=875-15x

Solve for x:
25x+15x=875-425
40x=450
x=11.25
The answer is 11.25 weeks.
5 0
3 years ago
-6+14 =12-8x what is x
navik [9.2K]
8=12-8x
-4=8x
-4÷8=8x÷8
-0.5=x
5 0
3 years ago
What are the solutions of the quadratic equation (x+3)2=49?
Vesnalui [34]
\bf (x+3)^2=49\implies x+3=\pm\sqrt{49}\implies x+3=\pm 7
\\\\\\
x=\pm 7 -3\implies x=
\begin{cases}
4\\
-10
\end{cases}
8 0
3 years ago
Read 2 more answers
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