Answer: 5h+4=A
Step-by-step explanation:
She gets five dollars an hour so for one hour she gets five dollars, for two hours she gets 2 times 5 dollars (10 dollars), for three hours she gets 3 times 5 dollars (15 dollars) etc...
Now replace the 1,2,3... with the variable representing the hour. In this case it would be h. So 5h=five dollars per hour. Because you only put the kid to bed once, you add four at the end
Answer:
The constant of proportionality k is given by k=y/x where y and x are two quantities that are directly proportional to each other. Once you know the constant of proportionality you can find an equation representing the directly proportional relationship between x and y, namely y=kx, with your specific k.
Answer:
$11
Step-by-step explanation:
multiply $2 by four because they charge by hour and not by half hour. = 8
add $3 to 8. =11
Answer:
Step-by-step explanation:
cos (A+B) + sin (A-B) = 2 sin (45°+A) cos (45° + B)
= 2 (sin45°cosA + cos45°sinA)(cos45°cosB - sin45°sinB)
But sin45=cos45 =(sqrt2)/2
= 2 ((sqrt2)/2 *cosA + (sqrt2)/2 *sinA)((sqrt2)/2 *cosB -(sqrt2)/2 *sinB)
= 2 ((sqrt2)/2 *(cosA + sinA))*((sqrt2)/2 *(cosB - sinB))
= 2*(sqrt2)/2 * (sqrt2)/2 * (cosA + sinA)*(cosB - sinB)
= (cosA + sinA)*(cosB - sinB)
= cosAcosB +sinAcosB -cosAsinB - sinAsinB
Regrouping:
= (cosAcosB- sinAsinB) + (sinAcosB -cosAsinB)
= cos (A+B) + sin (A-B)
Answer:
74.36
Step-by-step explanation:
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