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3 years ago

Please I really need help 100 points

Mathematics

2 answers:

Amiraneli [1.4K]3 years ago

5 0

Answer:

Step-by-step explanation:

$\left\{\begin{array}{ccc}2x-3y=9&\text{multiply both sides by 5}\\3x+5y=4&\text{multiply both sides by 3}\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}10x-15y=45\\9x+15y=12\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad19x=57\qquad\text{divide both sides by 19}\\.\qquad x=3\\\\\text{Put the value of x to the second equation:}\\\\3(3)+5y=4\\9+5y=4\qquad\text{subtract 9 from both sides}\\5y=-5\qquad\text{divide both sides by 5}\\y=-1$

Afina-wow [57]3 years ago

4 0

Multiply the first equation by 3 and the second equation by 2:

$\begin{cases}6x-9y=27\\6x+10y=8\end{cases}$

Subtract the two equation to get rid of the x variable:

$-9y-10y=27-8 \iff -19y = 19 \iff y = -1$

Use the value of y to determine the value of x: for example, using the first equation we have

$2x+3=9 \iff 2x=6 \iff x=3$

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Luke bought 256 ounces of strawberries. he divided them evenly between 8 different pies.

pychu [463]

Answer:

2 pounds.

Step-by-step explanation:

We have been given that Luke bought 256 ounces of strawberries. He divided them evenly between 8 different pies. We are asked to find the pounds of strawberries that Luke put on each pie.

First of all, we will convert 256 ounces into pounds.

We know that 1 pound equals 16 ounces. To convert 256 ounces into pounds, we need to divide 256 by 16.

$256$ $ounces=\frac{256}{16}$ $pounds=16$ $pounds$

Now we will divide 16 pounds by 8 to find number of strawberries put on each pie.

$Pounds$ $of$ $strawberries$ $on$ $each$ $pie=\frac{16}{8}$

$Pounds$ $of$ $strawberries$ $on$ $each$ $pie=2$

Therefore, Luke put 2 pounds strawberries on each pie.

3 0

2 years ago

What is equivalent to 2:6

Katena32 [7]

HI,THE ANSWER TO YOUR PROBLEM IS 1:3

HOPE THIS HELPED! D:

8 0

3 years ago

Read 2 more answers

Which values are solutions 4x greater than or equal to 35

Mamont248 [21]

Answer:

$\frac{5}{1/2}$ , 12, $\frac{8}{3/4}$ , 10

Step-by-step explanation:

$4x\geq 35$

$x \geq \frac{35}{4}$

$x \geq 8 \frac{3}{4}$

$\frac{5}{1/2}$ = 10

$\frac{8}{3/4}$ = 10.66

and 10

Because saying 5 over 1/2 is saying 5 divided by 1/2 which is the same as saying 5 * 2

8 over 3/4 is 8 divided by 3/4 which is 8 * 1.33.

A fraction is division. If you mean 5 and 1/2 as well as 8 and 3/4 then remove 5 and 1/2 from the answer.

6 0

2 years ago

The diagram shows the dimensions of a teepee. Find the volume of the building to the nearest cubic unit. Use 3.14 for pi.

LekaFEV [45]

The volume of a cone uses the following formula:

$V = \pi r^{2} \frac{h}{3}$

Our diameter is 20 feet, so divide this by 2 to find the radius:

$20 \div 2 = 10$

We now have all of our values need to fill in the formula. Plug in these values:

$\pi = 3.14, r = 10, h = 17$

$3.14 * 10^{2} * \frac{17}{3}$

$3.14 * 100 * 5.67$

$314 * 5.67 = 1780.38$

The volume of the cone is 1780 cubic feet.

7 0

2 years ago

Solve this equation. 5n+7=7(n+1)-2n

9966 [12]

Distribute 7 to both n and 1

7(n + 1) = 7n + 7

5n + 7 = 7n + 7 - 2n

Combine like terms

5n + 7 = 7n - 2n + 7

5n + 7 = 5n + 7

If you want to solve for n, subtract 7 from both sides

5n + 7 (-7) = 5n + 7 (-7)

5n = 5n

then divide 5 from both sides

5n/5 = 5n/5

n = n

Effectively, this equation is <em>unsolvable</em>

hope this helps

3 0

2 years ago

Read 2 more answers