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3 years ago

Jenny is 34 she has a 18yr old son how old did she have her son?

Mathematics

2 answers:

alekssr [168]3 years ago

6 0

Answer:

16 years old.

Step-by-step explanation:

All you do is subtract 18 from 34

salantis [7]3 years ago

5 0

Answer: 16

Step-by-step explanation:

Subtract her age by her son’s age

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Tim must read 2 books from a list of 7 recommended books for his summer reading program. In how many different ways can Tim choo

Marianna [84]

There are 21 ways Tim choose 2 books from the 7 recommended book

Solution:

Given that Tim must read 2 books from a list of 7 recommended books for his summer reading program

To find: different ways can Tim choose 2 books from the 7 recommended books

This is a combination problem

A combination is a selection of all or part of a set of objects, without regard to the order in which objects are selected

The formula for combinations is:

$n C_{r}=\frac{n !}{r !(n-r) !}$

where n represents the number of items, and r represents the number of items being chosen at a time

Here we have to choose 2 books from 7 books

Therefore, n = 7 and r = 2

Substituting values in above formula, we get

$\begin{aligned}&7 C_{2}=\frac{7 !}{2 !(7-2) !}\\\\&7 C_{2}=\frac{7 !}{2 ! \times 5 !}\end{aligned}$

For a number n, the factorial of n can be written as,

$n !=n \times(n-1) \times(n-2) \dots \dots \times 2 \times 1$

Therefore, we get

$7 C_{2}=\frac{7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1}{2 \times 1 \times 5 \times 4 \times 3 \times 2 \times 1}\\\\7C_2 = 7 \times 3 = 21$

Thus there are 21 ways Tim choose 2 books from the 7 recommended book

7 0

3 years ago

Determine if each pair of ratios or rates is equivalent. Explain your reasoning. 288 miles on 12 gallons of fuel; 240 miles 10 g

lesantik [10]

Yes they are equivalent. This is because if you simplify each fraction : 288/12 and 240/10 they both equal 24.
$\frac{288}{12} = 24$
$\frac{240}{10} = 24$

3 0

3 years ago

Plz i need this asap, if you do not know all of them, plz do not answer

Lelechka [254]

1. sqrt 52 = 7.211 rounds to 7

2. irrational number

3. sqrt 441 = 21....rational

4. 12^2 + 3^2 = h^2
144 + 9 = h^2
153 = h^2
sqrt 153 = h
12.4 = h <===

5. 6^2 + b^2 = 18^2
36 + b^2 = 324
b^2 = 324 - 36
b^2 = 288
b = sqrt 288
b = 16.97 rounds to 17 <==

6. 39^2 + 52^2 = c^2
1521 + 2704 = c^2
4225 = c^2
sqrt 4225 = c
65 = c
(39 + 52) - 65 = 91 - 65 = 26 miles shorter <==

7. 4^2 + b^2 = 16^2
16 + b^2 = 256
b^2 = 256 - 16
b^2 = 240
b = sqrt 240
b = 15.49 rounds to 15.5 <==

8. ?

8 0

3 years ago

Judy bought

a_sh-v [17]

She sold it for 375 dollars

3 0

3 years ago

Read 2 more answers

The vertex angle of an isosceles triangle measures 40°. What is the measure of a base angle?

disa [49]

Triangle is 180 degrees, so you will subtract 50 from 180 which will give you 130.

8 0

3 years ago