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2 years ago

Help me plssssssssssss

Mathematics

1 answer:

DanielleElmas [232]2 years ago

6 0

Answer:

A. 23.1

B. 0.3

Step-by-step explanation:

When rounding to one decimal place, look at the next number, (in this case, in the hundredths column) if the number is 5 or above, round up and if it’s four or below, round down

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tudents are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. There are

AlladinOne [14]

In this question, they gave you the system of equations. You just need to use the two of them.

We want to find the m or the number of the multiple-choice questions. So we need to turn our last equation in the form of 'm's by translating the 'f's into 'm's.

$m + f = 15$
$f = 15 - m$

If we know the m form of f, we can convert the second equation and find the answer: $3m + 5f = 51$

Plug in the m value of f: $3m + 5(15 - m) = 51$

Distribute the 5: $3m + 75 - 5m = 51$

Subtract -75 from both sides: $3m - 5m= 51 - 75$

Combine like terms: $- 2m = - 24$

Divide both sides by -2: $m = 12$

So, we learned that the number of the multiple-choice questions is 12.

6 0

3 years ago

Help I need answers now

Juli2301 [7.4K]

Answer:

The Answer in Exact Form:

-3/22

In Decimal Form:

-0.136

Step-by-step explanation:

- $\frac{3}{2}$ ÷5 $\frac{1}{2}$ =-3/22

8 0

3 years ago

What does this equal?

lukranit [14]

Answer:

87/100

Step-by-step explanation:

Convert the decimal number to a fraction by placing the decimal number over a power of ten. Since there are

numbers to the right of the decimal point, place the decimal number over

(

100

)

. Next, add the whole number to the left of the decimal.

6 0

3 years ago

a 3D printer can print 5 phone cases in hundred and 50 minutes at this rate how many phone cases can be printed in 750 minutes

garik1379 [7]

Answer:

It should be 25.

Step-by-step explanation:

If you divide 750 by 150 you get 5, then you multiply 5 by 5 and get 25.

3 0

3 years ago

Solve for x THANK YOU

Anestetic [448]

Answer:

$x=\dfrac{-17+ \sqrt{451} }{18}, \quad x=\dfrac{-17- \sqrt{451} }{18}$

Step-by-step explanation:

$\textsf{Given equation}:$

$\dfrac{2}{3}x+\dfrac{3x}{x}=\dfrac{4x}{2}(3x+6)$

$\textsf{Cancel the common factor } x \textsf{ in }\dfrac{3x}{x}:$

$\implies \dfrac{2}{3}x+3=\dfrac{4x}{2}(3x+6)$

$\textsf{Simplify }\dfrac{4x}{2}\textsf{ by dividing the numbers}:$

$\implies \dfrac{2}{3}x+3=2x(3x+6)$

$\textsf{Apply the distributive law}\quad \:a\left(b+c\right)=ab+ac:$

$\implies \dfrac{2}{3}x+3=6x^2+12x$

$\textsf{Multiply both sides by 3 to cancel the denominator of }\dfrac{2}{3}:$

$\implies \dfrac{2}{3}x\cdot 3+3\cdot 3=6x^2\cdot 3+12x \cdot 3$

$\implies 2x+9=18x^2+36x$

$\textsf{Switch sides}:$

$\implies 18x^2+36x=2x+9$

$\textsf{Subtract }2x \textsf{ from both sides}:$

$\implies 18x^2+36x-2x=2x+9-2x$

$\implies 18x^2+34x=9$

$\textsf{Subtract 9 from both sides}:$

$\implies 18x^2+34x-9=9-9$

$\implies 18x^2+34x-9=0$

Solve using the Quadratic Formula:

$x=\dfrac{-b \pm \sqrt{b^2-4ac} }{2a}\quad\textsf{when }\:ax^2+bx+c=0$

Define the variables:

$\implies a=18, \quad b=34, \quad c=-9$

Substitute the defined variables into the quadratic formula and solve for x:

$\implies x=\dfrac{-34 \pm \sqrt{34^2-4(18)(-9)} }{2(18)}$

$\implies x=\dfrac{-34 \pm \sqrt{1156+648} }{36}$

$\implies x=\dfrac{-34 \pm \sqrt{1804} }{36}$

$\implies x=\dfrac{-34 \pm \sqrt{4 \cdot 451} }{36}$

$\implies x=\dfrac{-34 \pm \sqrt{4}\sqrt{451} }{36}$

$\implies x=\dfrac{-34 \pm 2\sqrt{451} }{36}$

$\implies x=\dfrac{-17 \pm \sqrt{451} }{18}$

Therefore, the solutions to the given equation are:

$x=\dfrac{-17+ \sqrt{451} }{18}, \quad x=\dfrac{-17- \sqrt{451} }{18}$

Learn more about the Quadratic Formula here:

brainly.com/question/28105589

brainly.com/question/23700639

3 0

2 years ago

Read 2 more answers