3 years ago

Angle A and angle B are complementary

Mathematics

1 answer:

Nikitich [7]3 years ago

4 0

Answer:

Step-by-step explanation:

∠A + ∠B = 90° {given they are complementary}

5x+ 15 + 30 = 90

5x + 45 = 90

5x = 90 - 45

5x = 45

x = 45/5

x = 9

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son4ous [18]

Answer:

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Step-by-step explanation:

a = 3, b = 5, c = 1

plug into quadratic formula

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3 years ago

Which equation represents a circle with a center at (–3, –5) and a radius of 6 units?

Shalnov [3]

Answer:

Step-by-step explanation:

The general equation of the circle is:

(x-h)²+(y-k)²=r²

(h, k)=(-3,-5) are the coordinates of the center of the circle.

r=6 is the radius

The equation of the circle is:

(x+3)²+(y+5)² = 36

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3 years ago

2.8% of 45 is what number? <br><br>I need the percent equation, the proportion, and the solution

Talja [164]

The percent equation is
n=2.8%×45 or n=0.028×45. where n is the unknown number.
the proportion would be
n/45=2.8/100
the answer is 1.26

5 0

3 years ago

Leonardo is solving the equation 4 (x minus one-fifth) = 2 and two-thirds. His work is shown. Where is his error?

Brilliant_brown [7]

Answer:

Step 3

Step-by-step explanation:

Leonardo is solving the equation 4 (x minus one-fifth) = 2 and two-thirds. His work is shown. Where is his error?

Given :

4(x - 1/5) = 2 2/3

Open the bracket

4x - 4/5 = 2 2/3

Add 4/5 to both sides

4x - 4/5 + 4/5 = 8/3 + 4/5

Lcm of 3 and 5 = 15

4x = (40 + 12) / 15

4x = 40/15 + 12/15

4x = 52/15

Multiply by 1/4

4x * 1/4 = 52/15 * 1/4

x = 52 / 60

x = 13 / 15

Hence, the error is in step 3

15/5 * 3 = 12

Rather ; Leonardo wrote 16

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3 years ago

A coin contains 999 grams of nickel and 161616 grams of copper, for a total weight of 252525 grams.

ale4655 [162]

64% because (161616/252525)(100)

4 0

3 years ago