7.Figure out the expression bellow
(7+3)x2-5
A.8
B.15
C.22
D.30
B
8.When Henry went to the pet store he noticed that there were 12 large fish tanks with goldfish.The store clerk told him that there were 107 goldfish in each tank.How many goldfish were there in all?
A.1200
B.1284
C.1296
D>1342
B?
9.Darin bought 28 feet of fencing.He used 9 3/4 feet of fencing for a flower garden and 4 5/12 feet of fencing for his tomato plants.Which expression can be used to find the amount of fencing Darin has left?
A.28 + 9 3/4 + 4 5/12
B.28 - 9 3/4 + 4 5/12
C.28 - 9 3/4 - 4 5/12
D.9 3/4 - 4 5/12
C?
10.Which shows the prime factorization of 75?
A.5^2
B.3^3x5
C.3x5^2
D.3x5^3
C?
1.Which fraction is equal to 0.61?
A.6/10
B.61/10
C.61/100
D.61/1000
C
12.Talia's Tech Store gave away memory cards with the sale of every computer on April 18.They sold 23 computers on Saturday.Which integer represents the change in the number of memory cards Talia's Tech Store had at the end of day Saturday?
A.-23
B.-18
C.18
D.23
A?
All are right except for 10.
I'll rewrite the answer choices for number 10
A.5^3
B.3^2x5
C.3x5^2
D.3x5^3
Is it C ?
Yes, C is correct for # 10.
To find the expression, value, or answer to each question, we can follow the given information and apply the appropriate mathematical operations. Let's go through each question one by one:
7. The expression is (7+3)x2-5. To solve it, follow the order of operations: perform the addition inside the parentheses first, then the multiplication, and finally the subtraction.
(7+3)x2-5 = 10x2-5 = 20-5 = 15. So the answer is B. 15.
8. There are 12 large fish tanks with 107 goldfish in each tank. To find the total number of goldfish, multiply the number of tanks by the number of goldfish in each tank.
12 x 107 = 1284. So the answer is B. 1284.
9. Darin bought 28 feet of fencing and used 9 3/4 feet for a flower garden and 4 5/12 feet for his tomato plants. The expression that represents the amount of fencing Darin has left can be found by subtracting the used fencing from the total fencing.
28 - 9 3/4 - 4 5/12 = 28 - (39/4) - (53/12) = 28 - (117/12) - (53/12) = 28 - (170/12) = 28 - (85/6) = 28 - (14 1/6) = 13 5/6. So the answer is C. 28 - 9 3/4 - 4 5/12.
10. To find the prime factorization of 75, we need to express it as a product of its prime factors. Prime factors are prime numbers that divide the given number without leaving a remainder.
The prime factors of 75 are 3 and 5. So the prime factorization of 75 is 3 x 5 x 5, which is written as 3 x 5^2. Therefore, the answer is C. 3 x 5^2.
1. To find the fraction that is equal to 0.61, we need to express 0.61 as a fraction. The decimal 0.61 is equivalent to the fraction 61/100. So the answer is C. 61/100.
12. Talia's Tech Store sold 23 computers on Saturday, and they gave away memory cards with the sale of every computer. To find the change in the number of memory cards, we need to consider the direction of the change. Since they gave away memory cards, the number of memory cards will decrease. Since they sold 23 computers, the change in the number of memory cards will be negative. Therefore, the answer is A. -23.