Answer: (x+4)(x+5)
Step-by-step explanation:
x²+9x+20=(x+4)(x+5)
There would be 81 in grade 5
and 68 in grade 6
because 10% of 90 is 9 so 90 - 9 =81
and 15% of 80 is 12 so 80 - 12 = 68
Answer: He spends more time trading stickers by 15 minutes.
Step-by-step: 1 hour is 60 minutes. So 2 hours is 120 minutes. 120 minutes plus his 20 minutes is 140 minutes. Subtract it from his homework time and he spends 15 more minutes trading stickers.
Answer:
65
Step-by-step explanation:
Let x be the number and y be the another one.
x=4y-3
x-y=48
Substitute x=4y-3 into x-y=48
(4y-3)-y=48
3y=51
y=17
[Since we know x is larger than y (4y-3), we need to use y to calculate out x.]
Substitute y=17 into x=4y-3
x=68-3
x=65