what is the solution to the system of equations?
5x + 4y = 8
x - 2y = 10
(not multiple choice)
my answer: (-5, -1)
What are the missing values? (coincident)
4x + 5y = 8
8x + ____ y = _____
(Not multiple choice)
Im not sure how to do this one
collection of dimes and nickels is worth $6.90. but there are 96 coins all together.. how many coins are there?
______ (not multiple choice) not sure how to do it ..
______
-120
#1, you can decide for yourself if (-5,-1) is correct by subbing in those values into both equations.
You should be able to do this mentally.
-- A quick mental calculation shows that your answer does not work in either equation
from the 2nd: x = 2y + 10
plug that into the 1st:
5x + 4y = 8
5(2y+10) + 4y = 8
10y + 50 + 4y = 8
14y = -42
y = -3
then x = 2y+10 = -6+10
= 4
so x = 4, y = -3
2.
Since they are to be coincident, the 2nd equation should be equivalent to the 1st
since 4x was multiplied by 2 to get 8x in the 2nd
do that to the other two terms.
3. d+n = 96 --> n = 96-d
10d + 5n = 690
10d + 5(96-d) = 690
take it from there ....
–24 • 5 = ?
What is the product of –8 and –7?
The product of -8 and -7 is 56.
Which of the following has a product of –40?
A. (2)(20)
B. (–4)(–10)
C. (8)(–5)
D. (–7)(60)
Option C (8)(-5) has a product of -40.
Which integer represents the total change in altitude of an airplane descending 5 feet every second for 15 seconds?
A. 65
B. 75
C. –75
D. –65
The altitude of the plane is decreasing at a rate of 5 feet per second and it is descending for 15 seconds, therefore the total change in altitude can be found by multiplying 5 by 15 which gives us -75. So, the correct answer is C: -75.
10 • –5 • –4 • 3 = ?
10 • -5 = -50
-50 • -4 = 200
200 • 3 = 600
Therefore, 10 • –5 • –4 • 3 = 600.
–64 ÷ 4 = ?
-64 ÷ 4 = -16
–125 ÷ –5 =
-125 ÷ -5 = 25
–69 ÷ 3 = ?
-69 ÷ 3 = -23
What is the quotient of 156 and 12?
The quotient of 156 and 12 is 13.
What is the quotient of –196 and –7?
The quotient of -196 and -7 is 28.
What is the quotient of –112 and 2?
The quotient of -112 and 2 is -56.
Which of the following has a quotient of 5?
There can be infinite number of possibilities. Could you please provide me with the options for this question?
Which expression has the greatest quotient?
A. –20 ÷ –5
B. 8 ÷ –4
C. –6 ÷ –3
D. 12 ÷ –3
A. -20 ÷ -5 = 4
B. 8 ÷ -4 = -2
C. -6 ÷ -3 = 2
D. 12 ÷ -3 = -4
Out of these, -2 has the greatest quotient. Thus, option B (8 ÷ –4) has the greatest quotient.