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2 years ago

Here are 10 test scores: 30, 74, 76, 77, 78, 79, 80, 80, 82, 84. The mean of these scores is 74.

1 answer:

8 0

We add up all those numbers (excluding 30) and divide by the number of numbers (9). This results in 78.8 (round up to 79).

79-74 = 5. So the mean has increased by 5 points. (C)

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Need help with this (10 points)

Nikolay [14]

Answer:

5 is greater than equal to 5. So f(5)=5+8=13

Step-by-step explanation:

7 0

2 years ago

8) x - 5y = -15 x - 2y = -12

Alex787 [66]

Answer:

If solving for X. (didn't know if you were solving for X or Y.

x=2y-12

x=5y-15

Step-by-step explanation:

x-2y=-12

+2y on both sides

x=2y-12

x-5y=-15

+5y on both sides

x=5y-15

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2 years ago

Read 2 more answers

During the first part of a hike, Andre drank 1.5 liters of the water he brought. If this 50% of the water he brought, how much d

8090 [49]

Answer:

3 liters

Step-by-step explanation:

if 1.5 liters is 50% of the original amount, then to find the original amount you must multiply by two, or:

1.5 liters ×2=3 liters

8 0

3 years ago

Read 2 more answers

HELPPP:$

viktelen [127]

Answer:

Are 480/40 and 300/25 proportional? Cross products 48025 = 1200 and 300400 = 1200, so their salaries are proportional.

So in conclusion the answer is true.

Step-by-step explanation:

3 0

2 years ago

Read 2 more answers

If DX/DT= 2cm/s x=-1 y=x^2+1 DY/DT=??

kobusy [5.1K]

Answer:

$\frac{dy}{dt}$ = - 4 cm/s

Step-by-step explanation:

Let us revise the chain rule

If $\frac{dy}{dt}$ = a and $\frac{dx}{dt}$ = b, then

$\frac{dy}{dx}$ = $\frac{dy}{dt}$ ÷ $\frac{dx}{dt}$ = $\frac{a}{b}$

∵ y = x² + 1

- Use the differentiation to find $\frac{dy}{dx}$

∴ $\frac{dy}{dx}$ = 2x

∵ x = -1

- Substitute x by -1 in $\frac{dy}{dx}$

∴ $\frac{dy}{dx}$ = 2(-1)

∴ $\frac{dy}{dx}$ = -2

∵ $\frac{dy}{dt}$ = $\frac{dy}{dx}$ × $\frac{dx}{dt}$

∵ $\frac{dx}{dt}$ = 2 cm/s

∴ $\frac{dy}{dt}$ = (-2) × (2)

∴ $\frac{dy}{dt}$ = - 4 cm/s

8 0

3 years ago