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valentinak56 [21]
3 years ago
12

Evaluate the following polynomial expression when a = 2, b = 5, and c = -5. ab-3bc + 3 abc​

Mathematics
1 answer:
Likurg_2 [28]3 years ago
3 0

Answer:

2×5-3×5×-5+3×2×5×-5

10-15-25+6×-25

=-600

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2.3y +7 =-11 hehebbn​
Andre45 [30]

Answer:

y=-6

Step-by-step explanation:

3y+7=-11

3y=-11-7

3y=-18

y=-18/3

y=-6

4 0
3 years ago
6. ∠A and ∠B are vertical angles. M∠B= (3x+4)° and m∠A = (x+48)° find the measure of angle A
maks197457 [2]

In Triangle

ABC with the right angle at C, let a,b, and c be the opposite, the adjacent, and the hypotenuse of ∠A. Then, we have

sin A=ac⇒m∠A=sin−1(ac)

sin B=bc⇒m∠B=sin−1(bc)

I know its not the answer but I hope it was helpful

7 0
3 years ago
In a small town, 60% of the households have a pet dog. If a household has a pet dog, there is a 70% chance that the household al
Marrrta [24]

Using proportions, it is found that there is a 0.54 = 54% probability that a randomly selected household owns a cat.

<h3>What is a proportion?</h3>

A proportion is a fraction of total amount.

In this problem, the proportions associated with owning a cat are given by:

  • 70% of 60%(also have a dog).
  • 30% of 40%(do not have a dog).

Hence:

p = 0.7(0.6) + 0.3(0.4) = 0.42 + 0.12 = 0.54.

0.54 = 54% probability that a randomly selected household owns a cat.

More can be learned about proportions at brainly.com/question/24372153

8 0
3 years ago
To save money, a local charity organization wants to target its mailing requests for donations to individuals who are most suppo
mars1129 [50]

Answer:

The 80% confidence interval for difference between two means is (0.85, 1.55).

Step-by-step explanation:

The (1 - <em>α</em>) % confidence interval for difference between two means is:

CI=(\bar x_{1}-\bar x_{2})\pm t_{\alpha/2,(n_{1}+n_{2}-2)}\times SE_{\bar x_{1}-\bar x_{2}}

Given:

\bar x_{1}=M_{1}=6.1\\\bar x_{2}=M_{2}=4.9\\SE_{\bar x_{1}-\bar x_{2}}=0.25

Confidence level = 80%

t_{\alpha/2, (n_{1}+n_{2}-2)}=t_{0.20/2, (5+5-2)}=t_{0.10,8}=1.397

*Use a <em>t</em>-table for the critical value.

Compute the 80% confidence interval for difference between two means as follows:

CI=(6.1-4.9)\pm 1.397\times 0.25\\=1.2\pm 0.34925\\=(0.85075, 1.54925)\\\approx(0.85, 1.55)

Thus, the 80% confidence interval for difference between two means is (0.85, 1.55).

3 0
3 years ago
B. The total cost (1) after 8% sales tax is added to an item's price (p): 1.08p =
scoundrel [369]

Answer:

No

Step-by-step explanation:

6 0
3 years ago
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