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Ratling [72]
2 years ago
5

The Johnson twins were born thirteen years after their older sister. This year, the product of the three siblings' ages is exact

ly 653 more than the sum of their ages.
How old are the twins?
Mathematics
1 answer:
Anton [14]2 years ago
7 0
The twins are 23 years old
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A prime number less than 100 is selected randomly. what is the probability that its square has units digit $7$?
liberstina [14]
Any number ends with 0, 1, 2, 3, 4, 5, 6, 7, 8 or  9

Given any number. The square of this number is the last digit of square of the original numbers units digit.

For example

23*23 ends with 9 (3*3=9)

149*149 ends with 1 (9*9=81)

2564*2564 ends with 6 (4*4=16) 

and so on

so all the possible unit digits of a square number are {0, 1, 4, 5, 6, 9}

because:

0*0= 0 ; 1*1=1; 2*2=4; 3*3=9; 4*4=16; 5*5=25, 6*6=36; 7*7=49; 8*8=64, 9*9=81

Thus, the probability that the square of a number selected from any set of numbers being 7, is 0.


Answer: 0
 

4 0
3 years ago
A total of 750 students attended a conference at avenel high school the attendance of the number of girls was twice that of the
leva [86]

Answer:

250 boys attended the conference.

Step-by-step explanation:

First, divide 750 by 3 (one-third of the conference is boys) and you will get 250 (number of boys). If you wanted to find the number of girls too, you would simply double 250 to get 500 girls.

4 0
3 years ago
HELPP QUICK PLS <br> ILL GIVE BRAINLIEST
ryzh [129]

Answer:Part A: 13

Step-by-step explanation: look at the graph

7 0
3 years ago
A bucket of paint has spilled on a tile floor. The paint flow can be expressed with the function p(t) = 5t, where t represents t
Rainbow [258]
Because we know the area in terms of paint flow, and paint flow in terms of time, we can substitute p(t) for p in the A(p) equation.

A(p(t)) = A(t) = <span>π * (5t)^2 (assuming it's squared for the A(p).
B: 314 units^2

If A(p) = </span>πp2 (instead of p^2), then A(t) = 10πt
B: 31.4 units^2
4 0
3 years ago
Read 2 more answers
A farmer is digging a ditch across his field.
Nitella [24]

Answer:

Let us consider that ,

The worker can complete the work in x hours .

So, he can complete 1/x part of work in 1 hour.

Now, The workers does 2/3 of what he does. So they do 2/3(1/x) part of work in 1 hour . 2/3x work in 1 hour .

Consider them all working together,

So work done in one hour, = 1/x + 2/3x + 2/3x = 3 + 4 / 3x = 7/3x .

So, They taken 1 hour to complete 7/3th part of work. So, In 3x/7 hours , They all can complete the work.

Ratio of the time taken by all instead of only one = 3x/7 : x = 3/7 .

So ,The required option is 3/7

Hope my answer helped you!

Step-by-step explanation:

5 0
2 years ago
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