Answer:
56
Step-by-step explanation:
8*(8+6)
8*14=112
112/2=56
If the legs are length a and b and hyptonuse is c then
a²+b²=c²
so
if the legs are 20 and 21 and the hypotnuse is x then
20²+21²=x²
400+441=x²
841=x²
29=x
2x-3 + 7x - 10 = 32
9x -13 = 32
9x = 45
X=5
<span>x is the amount the wife received
</span><span>The wife received twice as much as the daughter = x/2
</span><span>the son received $1,000 more than the daughter = x/2 + 1000
</span> x + x/2 + x/2 + 1000 = 9000
2x = 8000
x = 4000(wife)
x/ 2 = 2000 (daughter)
x/2 + 1000 = 2000+ 1000 = 3000 (son)
answer
expressions represents the amount received by the son = x/2 + 1000
<span>amount the wife received = 4000
</span><span>amount the son received = 3000
</span><span>amount the daughter received = 2000</span>
We conclude that the starting average grade is 79.17%
<h3>
How to write the equation and solve it?</h3>
There are 50 students, let's say that the grades are measured between 1% and 100%.
And the average grade of the 50 students is A.
We know that after it increased by 20%, the average of the grades is 95.
Then we just need to solve the percentage equation:
95 = A*(1 + 20%/100%) = A*(1.2)
95/1.2 = A = 79.17
We conclude that the starting average grade is 79.17%
If you want to learn more about percentages:
brainly.com/question/843074
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