Answer:
$75
Step-by-step explanation:
Put the number where the variable is and do the arithmetic:
A = 52 +23 = 75
Debra earns $75 in a week that she sells 23 books.
It could include all real numbers, really. If you have +$130 you could use them to pay for something. If you have -$27.5 you need to pay this sum to the bank, since you overused your credit.
Answer:
20x/100 = 34/1
20x = 3400
x = 170
Step-by-step explanation:
Standard form: 100,000,000 (100 million)
Scientific form: 1 * 10
.
Answer:
504 cm squared
Step-by-step explanation:
To find the surface area, find the area of the square base and add it to the area of each triangle face.
Find the area of the base by multiplying base length by base length.
Here the base is 12 x 12 = 144.
Find the area of each triangle face by multiplying 1/2 * b*h.
Here the area is 1/2 * 12 * 15 = 90. Since there are 4 faces, the total area is 4 * 90 = 360.
Together the surface area is 360 + 144 = 504.
