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just olya [345]
3 years ago
11

Kai calculates that he spends 15% of the school day in science class. If he spends 42 minutes in science class, how many minutes

does Kai spend in school each day? Can someone tell me how to do that with fractions and cross products or something

Mathematics
1 answer:
MissTica3 years ago
6 0
You need to first multiply 100 by 42 then divide by 15

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2. The electrical resistance R of a wire varies inversely with the square of its diameter d. If a wire with a
Mariulka [41]

Answer:

0.225 \Omega =225 m\Omega

Step-by-step explanation:

We know (Ohm second law) that R= \frac{k}{d^2} where k inlcudes the rest of the parameters (material, lenght). In our situation we have k= 0.4\cdot9 \Omega mm^2. The moment the diameter becomes 8mm R becomes

R= {{0.4\cdot 9}\over{16}} \Omega = 0.225 \Omega

4 0
3 years ago
Is 40/25 equivalent to 32/20
Artyom0805 [142]

Answer:

Yes, 40/25 is equivalent to 32/20.

8 0
3 years ago
Read 2 more answers
You have ​$55 in your bank account. Each week you deposit $8 from your allowance and $15 from your paycheck. The equation b=55+(
scoundrel [369]
<h3>After 6 weeks from now you will have $190 in your bank account</h3>

<em><u>Solution:</u></em>

Given that,

You have ​$55 in your bank account

Each week you deposit $8 from your allowance and $15 from your paycheck

<em><u>The equation that gives the amount b in your account after w weeks is:</u></em>

b = 55 + (15 + 8)w

<em><u>How many weeks from now will you have $190 in your bank account ?</u></em>

b = 190

w = ?

Therefore,

190 = 55 + (15 + 8) w

190 = 55 + 23w

23w = 190 - 55

23w = 135

Divide both sides by 23

w = 5.869 \approx 6

Thus after 6 weeks from now you will have $190 in your bank account

7 0
3 years ago
Find the value of x. Give reasons to justify your solution. D ∈ AC
miskamm [114]

Answer:

x = 13

Step-by-step explanation:

Find the diagram attached

From the diagram, the sum of angle of the straight line BCD is 180°. Hence;

<BCE+<ECF<90 = 180

<BCE+64+90=180

<BCE+154 = 180

<BCE = 180-154

<BCE = 26°

Next is to get x.

The sum of interior angles <BCE and <BEC is equal to exterior angle <ABE

<BCE + <BEC = <ABE

26+x = 3x

Collect like terms

26 =3x-x

26=2x

x = 26/2

x = 13

Hence the value of x is 13

7 0
3 years ago
The length of the rectangle is 10cm less than 4 times the width. If the perimeter is 1.3m, find the dimensions of the rectangle.
nadya68 [22]

Express your length and width as algebraic expressions:

width = x

length = 4x

Use the formula for the perimeter of a rectangle to solve for x:

perimeter = 2(length) + 2(width)

50 = 2(4x) + 2(x)

50 = 8x + 2x

50 = 10x

5 = x

The width (x) is 5 feet and the length (4x) is 20 feet.


5 0
3 years ago
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