Hello from MrBillDoesMath!
Answer:
10^7 choices
Discussion:
The first digit can be any of 10 choices : (0,1,2,3,4,5,6,7,8,9)
The second digit can also be any of the same 10 choices as numbers can be repeated.
So for a seven digit number there are a total of
10 * 10 * 10 * 10 * 10 * 10 * 10 ( 7 times)
= 10^7 numbers
Thank you,
MrB
Answer:
y= 4x -15
Step-by-step explanation:
Please see attached picture for full solution.
Answer:
<em><u>7</u></em><em><u> </u></em><em><u>frnds </u></em><em><u>will </u></em><em><u>play </u></em><em><u>soccer!</u></em>
Step-by-step explanation:
<em><u>8</u></em><em><u>+</u></em><em><u>5</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>1</u></em><em><u>3</u></em>
<em><u>2</u></em><em><u>0</u></em><em><u> </u></em><em><u>-</u></em><em><u> </u></em><em><u>1</u></em><em><u>3</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>7</u></em>
<em><u>I </u></em><em><u>hope </u></em><em><u>it </u></em><em><u>helps </u></em><em><u>u </u></em><em><u>dear!</u></em><em><u> </u></em><em><u>(^^)</u></em>
F(2a)=35
f(2a)=(2a)^2-1=35
(2a)^2-1=35
add 1 both sides
(2a)^2=36
sqrt both sides
2a=+/-6
divde 2
a=+/-3
a=3 or -3
Answer:
tons of high steel and tons of low steel
Step-by-step explanation:
Let x be the number of tons of high grade steel and y be the number of tons ow low grade steel needed.
In x tons of high grade steel there are
tons of iron
tons of magnese
In y tons of low grade steel there are
tons of iron
tons of magnese
NASA orders 500 tons of steel, so
and specifies that it must be in the proportion 80% iron and 20% magnese, so
From the first equation,
Substitute it into the second equation: