Answer:
Step-by-step explanation:
7h + 50= 99
99-50 =49
7h=49
49/7
h=7
here's the steps i don't know which part you need
Answer:
Step-by-step explanation:
we are given that
since m is greater than or equal to 0 it's a positive number therefore, the square root of m is defined and recall that √x²=|x| thus
remember that,|a|•|x|=|ax| hence,
and we're done!
Rate = 63.75/850=.075*100%= 7.5%
7.5% is Isabella's rate of commission.
Answer:
2.964
Step-by-step explanation:
Answer:
20kg of 25% copper alloy
30kg of 60% copper alloy
Step-by-step explanation:
There are 2 kinds of metal, first metal(A) have 25% copper while the second metal(B) has 60% copper. The metalworker want to create 50kg of metal, which means the total weight of both metals is 50kg (A+B = 50). The metalworker also want the metal made of a 46% which is 23kg(0.25A + 0.6B = 0.46*50). From these sentences, we can derive 2 equations. We can solve this with substitution.
A+B = 50
A= 50-B
Let's put the first equation into the second.
0.25A + 0.6B = 0.46 *50
0.25(50-B) + 0.6B =23
12.5 - 0.25B + 0.6B =23
0.35B=23 -12.5
B= 10.5/ 0.35= 30
Then we can solve A
A= 50-B
A= 50-30
A=20
