Answer:
-7
Step-by-step explanation:
-1-6 is like 1+6 but with a negative sign before it.
15 * 25 = 375 <=== simple multiplication
Answer:
4,000,000 + 500,000 + 8,000 + 200 + 20 + 7
Step-by-step explanation:
Isolate each number with value < 0, and expand.
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Let the time he spent bicycling at 11 mph be x and the time spent bicycling at 15 mph be y, then
x + y = 60 . . . (1)
7x + 11.75y = 600 . . . (2)
(2) x 7 => 7x + 7y = 420 . . . (3)
(2) - (3) => 4.75y = 180
y = 180 / 4.75 = 38
x = 60 - 38 = 22
Therefore, he should bicycle 22 minutes at 11 mph and 38 minutes at 15 mph.
