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skelet666 [1.2K]
3 years ago
12

PLEASE ANSWER FIRST ANSWER GETS BRAINLIEST -4y - 4 + (-3)

Mathematics
1 answer:
lianna [129]3 years ago
3 0

Answer:

-4y - 7

Step-by-step explanation:

Combine like terms. Note that there is one term with a variable (y), and two constant terms. Combine the constant terms. Note that one positive and one negative sign will result in a negative sign:

-4 + (-3) = -4 - 3 = -7

-4y - 7 is your answer.

~

You might be interested in
IQ scores are known to be normally distributed. The mean IQ score is 100 and the standard deviation is 15. What percent of the p
Masja [62]

Answer:

47.06% of the population has an IQ between 85 and 105.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 100, \sigma = 15

What percent of the population has an IQ between 85 and 105?

This is the pvalue of Z when X = 105 subtracted by the pvalue of Z when X = 85. So

X = 105

Z = \frac{X - \mu}{\sigma}

Z = \frac{105 - 100}{15}

Z = 0.33

Z = 0.33 has a pvalue of 0.6293.

X = 85

Z = \frac{X - \mu}{\sigma}

Z = \frac{85 - 100}{15}

Z = -1

Z = -1 has a pvalue of 0.1587

So 0.6293 - 0.1587 = 0.4706 = 47.06% of the population has an IQ between 85 and 105.

5 0
2 years ago
An executive invests 29,000, some at 8% and the rest at 7% annual interest. If he receives an annual return of $2,230, how much
jeka57 [31]

Answer:

Amount invested in A (8%) = $20,000

Amount invested in B (7%) = $9,000

Step-by-step explanation:

Given:

Total amount invested = $29,000

Interest rate A = 8% = 0.08

Interest rate B = 7% = 0.07

Annual return = $2,230

Find:

Amount invested in each

Computation:

Assume;

Amount invested in A = x

Amount invested in B = 29,000 - x

So,

Interest receive from A = x × 0.08

Interest receive from A = 0.08 x

Interest receive from B = (29000 - x) × 0.07

Interest receive from B = 2,030 - 0.07 x

Annual return = Interest receive from A + Interest receive from B

2,230 = 0.08 x + 2,030 - 0.07 x

x = 20,000

Amount invested in A = $20,000

Amount invested in B = 29,000 - $20,000

Amount invested in B = $9,000

8 0
3 years ago
Brinns kitchen area is 81 square feet. The kitchen is 9 times as many square feet as Brinns kitchen pantry. If the pantry is 3 f
lbvjy [14]

Answer:

The length of Brinn's Pantry is 3ft

Step-by-step explanation:

Area of Brinn's Pantry is

81

9

=

9

sq.ft

The length of Brinn's Pantry is

9

3

=

3

ft [Ans]

6 0
3 years ago
Help please I need this last one done
alex41 [277]
The answer is A. 550
Explanation: I took this test in the bathroom and I got it correct
5 0
2 years ago
Read 2 more answers
Please do correctly! I will mark you Brainliest!
ehidna [41]

Answer:

Step-by-step explanation:

3*3 + 1/2*3*3 = 9+4.5 = 13.5

3 0
2 years ago
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