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4 years ago

I need help plz and thanks

Mathematics

1 answer:

Ganezh [65]4 years ago

6 0

For both of these questions, we have to use PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition, Subtraction. This is the order that we need to do things.

1.)

(1 x 2) x 3^2 x 4 + 5

Parentheses - multiplication

2 x 3^2 x 4 + 5

Exponents

2 x 9 x 4 + 5

Multiplication

72 + 5

Addition

77

2.)

8 + 6 x 3 x 4 x 8

Multiplication

8 + 576

Addition

584

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24=×+7 ayudenme por favor :)

n200080 [17]

Answer:

24 -7 = x+7-7

17 = x

x = 17

so the solution set of

x is x = 17

3 0

3 years ago

Suppose 250 randomly selected people are surveyed to determine if they own a tablet. Of the 250 surveyed, 98 reported owning a t

SashulF [63]

Answer:

The true proportion for the population would be between 0.386 and 0,398 (0.392±0.06) in 95% confidence level.

Step-by-step explanation:

Confidence interval for true population proportion can be computed as p±ME where

p is the sample proportion ( $\frac{98}{250}=0.392$ )
ME is the margin of Error from the mean

and margin of error (ME) can be found using the formula

ME= $\frac{z*\sqrt{p*(1-p)}}{\sqrt{N} }$ where

z is the corresponding statistic in 95% confidence level (1.96)
p is the sample proportion ( $\frac{98}{250}=0.392$ )

N is the sample size (250)

Using the numbers

ME= $\frac{1.96*\sqrt{0.392*0.608}}{\sqrt{250} }$ ≈ 0.06

Then the true proportion for the population would be p±ME = 0.392±0.06 in 95% confidence level.

6 0

3 years ago

Evaluate for d = 2. 2(d + 4d)

Sav [38]

Substitute 2 for d.

$2(d + 4d) \\ 2(2 + (4 \times 2)) \\ 2(2 + 8) \\ 2(10) \\ 20$

6 0

4 years ago

Read 2 more answers

Solve for x. 18 ÷ x = -2 x = _____

Eddi Din [679]

Answer:

-9

Step-by-step explanation:

18÷x = -2

18 = -2×x

18 = -2x

-9 = x

x = -9

6 0

3 years ago

Read 2 more answers

If c varies directly as the square root of d, and c=14, when d = 64, find c when d= 324

zubka84 [21]

Answer:

c = 31.5

Step-by-step explanation:

Given c varies directly as $\sqrt{d}$ then the equation relating them is

c = k $\sqrt{d}$ ← k is the constant of variation

To find k use the condition c = 14 when d = 64, then

14 = k × $\sqrt{64}$ = 8k ( divide both sides by 8 )

1.75 = k

c = 1.75 $\sqrt{d}$ ← equation of variation

When d = 324 , then

c = 1.75 × $\sqrt{324}$ = 1.75 × 18 = 31.5

5 0

3 years ago