Answer:
642.39
Step-by-step explanation:
To get the increase,first get the given % of the amount and then add the result gotten to the amount
So, firstly
15% of 490
Make 15% a decimal by dividing it by 100
15/100 x 490
0.15 x 490 = 73.5
Increase = 490 + 73.5
= 563.5
Further so,
14% increase of 563.5
We do same as we did above
14/100 x 563.5
0.14 x 563.5 = 78.89
Therefore,
Increase = 563.5 + 78.89
= 642.39
Answer:
Sean swam 12 laps.
Step-by-step explanation:
Let S represent Sean
Let S+2 represent Amy
Let 2S represent Katie
Let 2S + 4 represent Tom
Now add together and set it equal to 78
S + S+2 + 2S + 2S+4 = 78
6S + 6= 78
6S=72
S=12
So, from the first term, to the fifteen term, there are 14 terms to go through.
that means, if say the common difference is say "d", we have to add "d" 14 times, to get to the 15th term, lemme make a quick table,

and surely you know how much that is.
4x+32
4 goes into 4 1 time. (4/4=1)
4 goes into 32 8 times. (32/4=8)
We can factor out 4 from both numbers.
4(1x+8)
aka 4(x+8)