Mental Math
4x + 20 =0
-5
2x2 - 7x = 39 (*hint: use factorization or the quadratic formula)
x = 13/2 and x = -3
If a clock shows 2:45 PM, how many minutes until 4:00 PM?
75 minutes
Which hormone regulates blood sugar levels by lowering glucose concentration?
Insulin
33 + 23 = ?
35
If (3a + 2b) : (5a + 3b) = 18 : 29
find the a : b
a : b = 4 : 3 (or a/b = 4/3)*
A runner completes 10 km in 40 minutes. What is their speed in km per hour?
15 km / hour
A rectangle has a perimeter of 36 cm. If its length is 10 cm, what is its width?
8cm
26 * 24 = ?
1024
The angle of elevation of the top of a tower at a distance of 120 m from its foot on a horizontal plane is found to be 30 deg. Find the height of the tower.
69.28 m (height of tower = 120 x tan 30 deg)
A store increases the price of a $120 item by 25%, then applies a 20% discount on the new price. What is the final price?
$120
What metal is liquid at room temperature?
Mercury
3/7 + 2/5
29/35
The hypotenuse of the right triangle is 13 cm and the difference between the other two sides is 7 cm. Find the unknown two sides, using algebra.
5 cm and 12 cm* (Note: the students have to show their work, they can't cheat just because they know the pythagorean triplet (5, 12, 13) haha)
The sum of three consecutive even numbers is 90. What are the numbers?
28, 30, and 32
What is the Roman numeral for 1542?
MDXLII
4/5 * 3/2 + 5/9
79/45
Prove the following:
tan A + cot A = sec A cosec A
ANSWER REVEALED LATER
A train leaves Station A at 60 mph. Another train leaves Station B, 300 miles away, at 90 mph toward Station A. How long until they meet?
2 hours
What causes tides on Earth?
The Moon's gravity