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3 years ago

I thought of a number. I added 15, tripled it and then subtracted 3 from the result. I got 42. What was my number?

Mathematics

1 answer:

Natasha_Volkova [10]3 years ago

4 0

Answer:

Step-by-step explanation:

15 x 3 = 45 - 3 = 42

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The surface area of this triangular pyramid, whose base and lateral faces are congruent equilateral triangles, is __ square inch

DedPeter [7]

Answer:

The surface area is equal to $390\ in^{2}$

Step-by-step explanation:

The surface area of the triangular pyramid is equal to the area of its four triangular faces

In this problem

$SA=4[\frac{1}{2}(b)(h)]$

we have

$b=15\ in$

$h=13\ in$

substitute the values

$SA=4[\frac{1}{2}(15)(13)]=390\ in^{2}$

4 0

3 years ago

Read 2 more answers

The Graduate Record Examination (GRE) is a test required for admission to many US graduate schools. Student’s scores on the quan

Dmitry_Shevchenko [17]

Answer with Step-by-step explanation:

Since we have given that

Mean = 150

Standard deviation = 8.8

An admissions officer at a large graduate school believes the mean is less than 150.

a)Determine the null and alternative hypotheses.

So, hypothesis :

$H_0:\mu =150\\\\H_a:\mu\neq 150$

b)Explain what it would mean to make a Type I Error.

As we know that Type 1 error are those errors in which null hypothesis is supposed to be rejected but not get rejected.

So, here, mean is not less than 150 but in actual it is less than 150.

c)Explain what it would mean to make a Type II Error.

As we know that Type II error are those errors in which null hypothesis is not supposed to be rejected but it gets rejected.

So, mean is less than 150 but actually it is not less than 150.

3 0

3 years ago

Mrs. Paige gave her daughter, Megan, $700 to open a savings account. Each month, Mrs. Paige gives Megan $25 to deposit into her

Firdavs [7]

Answer:

700 + 25m = 1000 is the correct equation

Step-by-step explanation:

In this question, we are tasked with finding the equation that represents the number of months m which in which megan will have $1000 in her account.

Now for her daughter, there are two kinds of ways she generates money for he account. The $700 see money her mother gave her and the $25 she has per month.

Thus after m months, the total she would have raised from the $25 each would be $25m

Now, we add this to the $700 see money and equate to $1000

Mathematically we have;

700 + 25m = 1,000

4 0

3 years ago

Please I need some answers a few is fine

Nataly_w [17]

Answer:

a. 9 b.36 c. 100 d. 13689

8 0

4 years ago

What is 0.003is 1/10 of

Whitepunk [10]

0.003 is 1/10 of 0.03.

Just multiply the 0.003 by 10 and you'll get the result. The easiest way to multiply such numbers is to move the dot one position to the right (it would be 2 positions if multiplying by 100, 3 by 1000 etc.). You can do the same with dividing, just remember to move to the left then.

6 0

4 years ago