All categories

2 years ago

. Using the rounding off technique, find the rough estimated difference of the given decimals.

Mathematics

1 answer:

nikitadnepr [17]2 years ago

3 0

Answer:

19. 188

20. 18

21. 5

21. 4

Step-by-step explanation:

634.58 would round up to 635 and 436.79 would round up to 437.

20. 37.86 would round up to 38 and 19.92 would round up to 20.

21. 14.49 would round to 14 and 8.59 would round up to 9.

22. 7.45 would round down to 7 and 2.93 would round up to 3.

You might be interested in

Sheldon wants to buy a laptop that costs $ 450 from an electronics store . He has two coupons to choose from coupon A which give

Gekata [30.6K]

Answer:

Coupon B

Step-by-step explanation:

Given

$Price = \$450$

$Coupon\ A = \$80$

$Coupon\ B = 20.5\%$

Required

Which coupon is better

From the question, we have:

$Coupon\ A = \$80$

$Coupon\ B = 20.5\%$

Coupon B means that:

$Coupon\ B = 20.5\% * \$450$

$Coupon\ B = 0.205 * \$450$

$Coupon\ B = \$92.25$

By comparison:

Coupon B gives him a better buy because: $\$92.25 > \$80$

7 0

3 years ago

Which of the following statements is supported by Chargaff's rule about the composition of DNA?

tresset_1 [31]

The number of adenine sim a strand of DNA is equal to the number of thymines.

5 0

3 years ago

Can u guys help me with this

nlexa [21]

Answer:

Step-by-step explanation:

A.) 16500 Seconds

B.) 12569 Seconds

C.) 38116 Seconds

D.) 20700 Seconds

E.) 7256

4 0

2 years ago

What is the measure of DBE? A. 120 B. 75 C. 45 D. 60

vladimir1956 [14]

Hi!

The intersecting chords theorem states that when two chords of a circle intersect, they form a pair of vertical angles (in this case angle DBE and ABC), and the measure of those angles (since they're congruent, it's the same) is equal to half of the sum of the two intercepted arcs.

That rule applies here. In this case, the intersecting chords are line AE and DC (you can tell because they end on the circle, and they have two endpoints on it), and the intercepted arcs are arc DE and arc AC, with measures of 45 degrees and 75 degrees (respectively).

So to find the measure of angle DBE (one of the vertical angles), just take the sum of the measures of the two intersected arcs, and then divide by 2. In this case, it's 45 + 75, to get 120 degrees, dividing by 2 gets 60 degrees.

So therefore your answer is 60 degrees, or B.

Hope this helped!

8 0

3 years ago

In a student body, 50% use Google Chrome, 9% use Internet Explorer, 10% Firefox, 5% Mozilla, and the rest use Safari. In a group

Likurg_2 [28]

Answer:

The probability that exactly 1 student is using Internet Explorer and at least 3 students are using Chrome is 0.1350.

Step-by-step explanation:

Denote the events as follows:

C = a student uses Google chrome

E = a student uses Internet explorer

F = a student uses Firefox

M = a student uses Mozilla

S = a student uses Safari

Given:

P (C) = 0.50

P (E) = 0.09

P (F) = 0.10

P (M) = 0.05

P (S) = 0.26

A sample of n = 5 students is selected.

The probability that exactly 1 student is using Internet Explorer and at least 3 students are using Chrome is:

P (E = 1 ∩ C ≥ 3) = P (E = 1 ∩ C = 3) + P (E = 1 ∩ C = 4) - P (E = 1 ∩ C = 5)

The probability distribution of a student using any of the browser is Binomial.

Compute the probability that exactly 1 student is using Internet Explorer and at least 3 students are using Chrome as follows:

P (E = 1 ∩ C ≥ 3) = P (E = 1 ∩ C = 3) + P (E = 1 ∩ C = 4) - P (E = 1 ∩ C = 5)

= P (E = 1) [P (C = 3) + P (C = 4) - P (C = 5)]

$={5\choose 1}(0.09)^{1}(1-0.09)^{5-1}[{5\choose 3}(0.50)^{3}(1-0.50)^{5-3}+{5\choose 4}(0.50)^{4}(1-0.50)^{5-4}\\-{5\choose 5}(0.50)^{5}(1-0.50)^{5-5}]\\=0.3086[0.3125+0.1563-0.0313]\\=0.3086\times 0.4375\\=0.1350$

Thus, the probability that exactly 1 student is using Internet Explorer and at least 3 students are using Chrome is 0.1350.

5 0

3 years ago