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2 years ago

Which operation should be performed first according to the order of operations?

1 answer:

3 0

It's C because according to order of operations it is PEMDAS ( parentheses, exponents, multiply, division, addition, subtraction)

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When a number is added to 1/5 of itself, the result is 24. The equation that models this problem is n + 1/5n = 24. What is the v

Zielflug [23.3K]

The answer is 20 since 1/5 of 20 is 4, and 20 + 4 = 24.

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3 years ago

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12. What is the perimeter of a football field measuring 360 feet by 160 feet?

lakkis [162]

A football field is rectangle so each matching side has the same length. Perimeter = adding all sides

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3 years ago

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A magician has a collection of 52 cards, with 26 red and 26 black cards. Four of these cards are classified as 'special', and tw

Brums [2.3K]

Answer:

option B (28/52)

Step-by-step explanation:

from probability

P(A∪B)=P(A)+P(B)-P(A∩B)

where

P(A∪B) = probability that event A or B happen

P(A∩B) = probability that event A and B happen simultaneously

P(A) = probability that event A happen

P(B) = probability that event B happen

the probability that the card is special or red

P( special or red)= P(special) + P(red) - P( special and red)

since

P(special)= 4/52

P(red) = 26/52

P( special and red) = 2/52

therefore

P( special or red)= 4/52 + 26/52 - 2/52 = 28/52

P( special or red)= 28/52

(option B)

6 0

3 years ago

1. Isosceles Triangle The two equal sides of an isosceles triangle are each 42

gavmur [86]

Answer:

1. H = 29 cm

2. θ = 44°

Step-by-step explanation:

1. We can find the height of the triangle by considering the isosceles triangle as two right triangles. The height can be found by using Pitagoras:

$L^{2} = H^{2} + B^{2}$

Where:

L: is the sides of the isosceles triangle = 42 cm

B: is the base = 30 cm

H: is the height =?

Then, the height is:

$H = \sqrt{L^{2} - B^{2}} = \sqrt{(42 cm)^{2} - (30 cm)^{2}} = 29.4 cm = 29 cm$

2. The two equal angles (θ) can be found using the following trigonometric identity:

$cos(\theta) = \frac{B}{L}$

$\theta = cos^{-1}(\frac{30 cm}{42 cm}) = 44.4^{\circ} = 44^{\circ}$

Hence, the two equal angles are 44°.

I hope it helps you!

3 0

2 years ago

May someone please help me, please? This is about exponents by the way. About 5 questions I need help with.

Phantasy [73]

Answer:

16=16^1

1/4=(1/2)^2

25= 5^2

49=7^2

16=4^2

Step-by-step explanation:

5 0

2 years ago