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Stels [109]
2 years ago
15

Pls somebody solve this I still don’t understand it yet :/ please

Mathematics
2 answers:
Fofino [41]2 years ago
8 0

Answer:

first blank 39, second 9/39 i think, and third 351

Step-by-step explanation:

i haven't done something like this in a long time so i dont know if its completely correct or correct at all

vovangra [49]2 years ago
7 0

Check the picture below.

the assumption being that the y-axis represents the water level more or less and the x-axis represents the minutes elapsed, we're also assuming this rate is constant, so it creates a straight-line on the cartesian plane.

We know that every 3 minutes pass, the level rises by 13 cm, let me reword that, we know that as the "rise" is 13, the "run" is 3, well, slope is rise/run, that simply gives us a slope of 13/3.

Now, we have another point on the line, (9 , y), whatever "y" might be, we know that the slope is y/x or rise/run, so we can say that

\stackrel{\textit{given slope}}{\cfrac{13}{3}}=\stackrel{\textit{equivalent slope}}{\cfrac{y}{9}}\implies 117=3y\implies \cfrac{117}{3}=y\implies 39=y

we know the slope is 13/3 or namely 13 cm every 3 mins, what about for just 1 minute? we can simply get their quotient, 13 ÷ 3 which is about 4.3 cms/min.

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Calculate the area of QRS
Eduardwww [97]

Answer:

  153 cm²

Step-by-step explanation:

The area is given by the formula ...

  A = (1/2)bh

where b is the base length, and h is the height measured perpendicular to the base.

The diagram shows b = QR = 18 cm, and h = 17 cm. So, the area is ...

  A = (1/2)(18 cm)(17 cm)

  A = 153 cm²

7 0
3 years ago
Fifty balls are numbered 1 to 50 and a red dot is painted on those balls that are a multiple of 6. The balls are mixed into a ba
djyliett [7]

Answer:

the answer is 1350

Step-by-step explanation:

i got it right

7 0
3 years ago
Use scientific notation to estimate the number of inches in 1,225 miles. Include all calculations in your final answer. 1 inch ≈
mr_godi [17]

Answer:

  7.763×10^7 inches

Step-by-step explanation:

  (1225\,mi)\dfrac{1\,in}{1.578\cdot 10^{-5}\,mi}=\dfrac{12.25}{1.578}\cdot 10^{2-(-5)}\,in \approx 7.763\cdot 10^7\,in

When writing 1225 in scientific notation, it is convenient to choose an exponent so that the division result comes out with the right scale factor. It is easy to see that 1.2 < 1.6, so use of numbers with exactly one digit to the left of the decimal point would result in a fraction as an answer. We want the answer to have 1 digit left of the decimal point, so by scaling the operands to be 12. and 1.6, we get that result. Of course, the powers of 10 are adjusted accordingly.

This scaling process only matters if you're computing the results by hand. Any calculator can properly keep track of the required exponents.

__

"Back in the day" when slide rules were the calculating tool of choice, the operands and answer to any multiplication or division problem were only shown as 3 (sometimes 4) significant digits. All of the power-of-ten scaling was done "by hand" (usually, mentally). That is, the division would be 1225/1578 ≈ 776 × some scale factor. This is where thinking of the numbers as 12.25/1.578 = 7.76 comes in handy.

3 0
3 years ago
Rachel's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Rachel $4.30 per pound, and typ
Sergio039 [100]

Step 1

Write out the system of equations

let\text{ x represent pound of Type A coffee and y represent Type B coffee pound }\begin{gathered} 4.30x+5.9y=738.80----(1) \\ x+y=148---(2) \end{gathered}

Step 2

Find the value of one pound of type A coffee, x

\begin{gathered} From\text{ equation 2; x+y=148} \\ Therefore \\ y=148-x \end{gathered}\begin{gathered} Substitute\text{ for y in equation 1} \\ 4.30x+5.9(148-x)=738.80 \\ 4.30x+873.2-5.9x=738.80 \\ 873.2-738.80=5.9x-4.3x \\ 134.4=1.6x \\ x=84pounds \end{gathered}

Therefore the answer will be;

\begin{gathered} x+y=148 \\ 84+y=148 \\ y=64\text{ pounds} \\  \end{gathered}

The pounds of type B coffee she used is 64pounds

The pounds of type A coffee she used is 84 pounds

8 0
1 year ago
Pls help! Due soon!!
bogdanovich [222]

Answer:

See below ~

Step-by-step explanation:

1. 3d + 2

2. John = Kelly - 6

3. y/4 - 3

4. Thomas = 2(Luis)

5. 8p + 6

6. x³ + 5

3 0
2 years ago
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