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2 years ago

Can anyone help me on this problem, please? It's from a section on literal equations.

Mathematics

2 answers:

saveliy_v [14]2 years ago

7 0

145 =45+20h
100=20h
h=5

Agata [3.3K]2 years ago

4 0

If he charges $145 he worked for 5 hours at $20 an hour

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A cylinder has a height of 13 centimeters and a radius of 4 centimeters. What is its volume? Use ≈ 3.14 and round your answer

Roman55 [17]

Answer:

Volume of a cylinder = 653.12 cm³

Step-by-step explanation:

Volume of a cylinder = πr²h

Where,

Height, h = 13 cm

Radius, r = 4 cm

π = 3.14

Volume of a cylinder = πr²h

= 3.14 × (4cm)² × 13 cm

= 3.14 × 16 cm² × 13 cm

= 653.12 cm³

Volume of a cylinder = 653.12 cm³

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Drupady [299]

Answer:

56°

Step-by-step explanation:

2x+3x+5=90

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5x=85

x=85÷5

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2 years ago

What is the least angle measure by which this figure can be rotated so that it maps onto itself?

Morgarella [4.7K]

C, 180 i would guess without a picture. do you have a photo of the figure?

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1 year ago

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Solve the equation on the interval [0, 2pi): 12cos^2 x-9=0<br><br><br> What to do?

siniylev [52]

Answer:

$\large\boxed{x=\dfrac{\pi}{6}\ \vee\ x=\dfrac{5\pi}{6}\ \vee\ x=\dfrac{7\pi}{6}\ \vee\ x=\dfrac{11\pi}{6}}$

Step-by-step explanation:

$12\cos^2x-9=0\qquad\text{add 9 to both sides}\\\\12\cos^2x=9\qquad\text{divide both sides by 12}\\\\\cos^2x=\dfrac{9}{12}\\\\\cos^2x=\dfrac{9:3}{12:3}\\\\\cos^2x=\dfrac{3}{4}\to\cos x=\pm\sqrt{\dfrac{3}{4}}\\\\\cos x=\pm\dfrac{\sqrt3}{2}\\\\\text{Look at the picture}\\\\x=\dfrac{\pi}{6}\ \vee\ x=\dfrac{5\pi}{6}\ \vee\ x=\dfrac{7\pi}{6}\ \vee\ x=\dfrac{11\pi}{6}$

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2 years ago