write an equation and solve for t seven less than a number t equals another number r plus 6. t = r 13 t = r - 1 t = -r 1 t = -r -13

Answers

Answer 1

Answer: t - 7 = r + 6 |add 7 to both sides

t = r + 13

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The grocery store is selling bags of grapefruits for $4. Each bag contains 8 grapefruits. What is the price per grapefruit?

Answers

8× = 4
×/8=4/8
× = .5

each grapefruit is .5

A nurse mixes 50 cc of a 60% saline solution with a 10% saline solution to produce a 20% saline solution. How much of the 10% solution should he use?

Answers

Answer:

The nurse should use 200cc of the 10% saline solution in order to produce a 20% saline solution.

Step-by-step explanation:

to the given mix we add a quantity of a lower mix to generate another.

50cc at 60% + Xcc at 10% = (50 + X)cc at 20%

50 x 60% + X x 10% = (50 + X) x 20%

30 + 0.1X = 10 + 0.2X

30 - 10 = 0.2X - 0.1X

20 = 0.1X

20/0.1 = X

X = 200

Final answer:

To produce a 20% saline solution, the nurse should use 200 cc of the 10% saline solution.

Explanation:

To find out how much of the 10% saline solution the nurse should use, we can set up an equation using the idea that the amount of saline in the mixture is equal to the sum of the amounts of saline in each solution.

Let's say the nurse uses x cc of the 10% saline solution. The amount of saline in the 60% saline solution will be 0.6 * 50 cc = 30 cc. The amount of saline in the 10% saline solution will be 0.1 * x cc = 0.1x cc.

Since the resulting solution is 20% saline, the total amount of saline in the mixture will be 0.2 * (50 + x) cc. Setting up the equation, we have 30 + 0.1x = 0.2 * (50 + x).

Simplifying the equation, we get 30 + 0.1x = 10 + 0.2x. Solving for x, we find that x = 200 cc.

Learn more about the Saline solution here:

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The amounts of paper waste generated in a region during two years were 41,300,000 tons and 50,500,000 tons. What was the total paper waste generated over these two years in the region, expressed in scientific notation? 91.8 ⋅ 107 tons

Answers

That would be 9.18x10^5

Answer:

9.18 ⋅ 10^7 tons

Step-by-step explanation:

SOMEONE PLEASE HELP ME
IT'S TIMED

Answers

Answer:

H = 8 cm

Step-by-step explanation:

The formula of a volume of a cylinder:

$V=\pi r^2H$

We have

$r=6cm,\ V=904.78\ cm^3$

Substitute:

$\pi(6^2)H=904.78\n\n36\pi H=904.78\qquad\text{use}\ \pi\approx3.14\n\n(36)(3.14)H=904.78\n\n113.04H=904.78\qquad\text{divide both sides by}\ 113.04\n\nH\approx8\ cm$

There are 30 students in a class. Which equations represent the situation if the number of boysis b and the number of girls is 7? Select all that apply.

A. b x 30 = 7

B.b = 30- 7

C. b = 30 + 7

D. b +7 =30

E. b x 7 =30

Answers

Step-by-step explanation:

A. b x 30 = 7E. b x 7 =30C. b = 30 + 7

How would you solve/approach this:
sin−1(sin(7π/3))

Answers

Hello,

7π/3≡π/3 (mod 2π)

arcsin(sin(x))=x ((f^-1 o f)=1)

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