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3 years ago

ANSWER QUICK!!!!

Mathematics

2 answers:

deff fn [24]3 years ago

8 0

Answer:

Step-by-step explanation:

When we write an equation, we look for something like is or equals

A.twice as much as a number 2x

B.12 less than a number x-12

C.half of a number is 15 1/2x =15

D.the difference of 20 and a number? 20-x

A,B, and D are expressions

vovikov84 [41]3 years ago

4 0

Answer:

12 less than a number

Step-by-step explanation:

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A board 120 inches long is divided into 2 sections. If the ratio of the 2 sections is 3:5, what are the lengths of the sections?

riadik2000 [5.3K]

Answer: D.45 inches, 75 inches

Step-by-step explanation:

Hi, to answer this question, first, we have to divide the board's length by the number of parts that conforms the 2 sections.

Since the ratio is 3/5, one section is made of 3 parts and the other section is made of 5 parts. 3+5 = 8 parts

120 / 8 = 15 inches

Each part measures 15 inches.

Now, we have to multiply each part's length by the number of parts that each section has. (3 and 5)

15x 3 = 45 inches

15 x 5 = 75 inches

3 1

4 years ago

Solve pls brainliest

castortr0y [4]

Answer:

c = 22 (= -18)
c = 23 (< -18 because - goes down).
4 - c ≤ -18

Step-by-step explanation:

Solve for 1st answer:

4 - c = -18
= 4 - 22 = -18
= 0 - 18 = -18 (Basically subtract 4 from 22)
= -18
c = 22

Solve for 2nd answer:

4 - c < -18
= 4 - 23 < -18
= 0 - 19 < -18
= -19
c = 23

Actual answer:

4 - c ≤ -18.

7 0

2 years ago

Please answer this correctly

12345 [234]

Answer:

21.66

20.545

20.479

20.15

20.1

4 0

3 years ago

Read 2 more answers

Y=-3x 2.5 is it linear

Scorpion4ik [409]

If you mean y= -3x*2.5 then yes, it's linear.

3 0

3 years ago

Read 2 more answers

The scores on a Psychology exam were normally distributed with a mean of 67 and a standard deviation of 8. Create a normal distr

Trava [24]

Answer:

(a) The percentage of the scores were less than 59% is 16%.

(b) The percentage of the scores were over 83% is 2%.

Step-by-step explanation:

Let the random variable X represent the scores on a Psychology exam.

The random variable X follows a Normal distribution with mean, μ = 67 and standard deviation, σ = 8.

Assume that the maximum score is 100.

(a)

Compute the probability of the scores that were less than 59% as follows:

$P(X$

$=P(Z$

*Use a z-table.

Thus, the percentage of the scores were less than 59% is 16%.

(b)

Compute the probability of the scores that were over 83% as follows:

$P(X>83)=P(\frac{X-\mu}{\sigma}>\frac{83-67}{8})$

$=P(Z>2)\\\\=1-P(Z$

*Use a z-table.

Thus, the percentage of the scores were over 83% is 2%.

(c)

It is provided n = 160 students took the exam.

Compute the probability of the scores that were over 75% as follows:

$P(X>75)=P(\frac{X-\mu}{\sigma}>\frac{75-67}{8})$

$=P(Z>1)\\\\=1-P(Z$

The percentage of students who received a score over 75% is 16%.

Compute the number of students who received a score over 75% as follows:

$\text{Number of Students}=0.16\times 160=25.6\approx 26$

Thus, the number of students who received a score over 75% is 26.

5 0

4 years ago