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3 years ago

Hi! can someone help with this please? i'm unsure of what to do :(

Mathematics

1 answer:

kompoz [17]3 years ago

8 0

Answer:

Step-by-step explanation:

The equation above is related to the model.

The 25 covers 5 out of 8 blocks. so 1 block has a value of 5 and there are 8 blocks therefore just like the equation the answer is 40

Hope this answer helped you

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125 percent of what number is 25

Marrrta [24]

20; 125% of 20 is 25
Hope this helps :)

8 0

3 years ago

It requires 350 joules to raise a certain amount of a substance from 10.0°C to 30.0°C. The specific heat of the substance is 1.2

Sonbull [250]

Answer:

15 g.

Step-by-step explanation:

The following data were obtained from the question:

Heat required (Q) = 350 J

Initial temperature (T1) = 10.0 °C

Final temperature (T2) = 30.0 °C

Specific heat capacity (C) = 1.2 J/g°C

Mass (M) =..?

Next, we shall determine the change in temperature.

This is illustrated below:

Initial temperature (T1) = 10.0 °C

Final temperature (T2) = 30.0 °C

Change in temperature (ΔT) =..?

Change in temperature (ΔT) = T2 – T1

Change in temperature (ΔT) = 30 – 10

Change in temperature (ΔT) = 20 °C

Finally, we shall determine the mass of the substance as follow:

Heat required (Q) = 350 J

Specific heat capacity (C) = 1.2 J/g°C

Change in temperature (ΔT) = 20 °C

Mass (M) =.?

Q = MCΔT

350 = M x 1.2 x 20

Divide both side by 1.2 x 20

M = 350 / (1.2 x 20)

M = 14.5 ≈ 15 g

Therefore, the mass of the substance is

15 g.

5 0

3 years ago

Which integer best represents a gain of 20 yards in football?

Varvara68 [4.7K]

Answer:

+20

Step-by-step explanation:

A gain is positive, so a gain of 20

+20

3 0

4 years ago

Read 2 more answers

Check my proof? Two diagonals of a parallelogram bisect each other?

SIZIF [17.4K]

Your proof is correct and very well done

6 0

3 years ago

Find the solution set.<br> 8x^2+7x-1=0

Likurg_2 [28]

Answer:

x = - 1, x = $\frac{1}{8}$

Step-by-step explanation:

Given

8x² + 7x - 1 = 0 ← in standard form

Consider the factors of the product of the x² term and the constant term which sum to give the coefficient of the x- term

product = 8 × - 1 = - 8 and sum = + 7

The factors are + 8 and - 1

Use these factors to split the x- term

8x² + 8x - x - 1 = 0 ( factor the first/second and third/fourth terms )

8x(x + 1) - 1(x + 1) = 0 ← factor out (x + 1) from each term

(x + 1)(8x - 1) = 0

Equate each factor to zero and solve for x

x + 1 = 0 ⇒ x = - 1

8x - 1 = 0 ⇒ 8x = 1 ⇒ x = $\frac{1}{8}$

3 0

3 years ago

Read 2 more answers