<span>4 hundreds 13 tens 5 ones = 400+13*10+5
= 400+130+5
= 535</span>
What do you need help with I cant help if I don't know what problems to solve
7.5 km/h
Step-by-step explanation:
Let's assign the speed of Jerry in still air as <em>x </em> (in km/h)
Let's assign the speed of the wind as <em>y </em>(in km/h)
With the wind as Jerry’s back, he takes 10 minutes to get to the library. We can create the following equation. (<em>we are converting the minutes to hours by dividing by 60</em>);
2.5 / (x + y) = 10/60
10x + 10y = 150
x + y = 15
With the wind against Jerry, he takes 15 minutes from the library. We can create the following equation;
2.5 / (x-y) = 15/60
15x – 15y = 150
x – y = 10
We can now solve the simultaneous equation by subtraction;
x + y = 15
x – y = 10
2y = 5
y = 5/2 = 2.5
y = 2.5 km/h
x = 7.5 km/h
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He counted too far. 5 x 2 is 10. He counted up to 25 which is 5 x 5, past what he is looking for.
Expression: 3(x - 5) = 21
= 3x - 15 = 21
= 3x = 21 + 15
= 3x = 36
= x = 36/3
= x = 12
In short, Your Answer would be: 12
Hope this helps!
