dondre54
01.10.2019 •
Mathematics
Ineed with math these is so hard can someone
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Ответ:
Part A:15
Part B:30
Ответ:
1. Evaluate 8a - b if a = 10 and b = 6
8×10 - 6 = 80 - 6 = 74
2. Evaluate expression if a=3 and b=4. 4b-5a
4×4 - 5×3 = 16 - 15 = 1
3. Evaluate Expressions a=3 b=4, 7a + 8b x 2
7×3 + 8×4×2 = 21 + 64 = 85
4.Strawberries are $1.95 a pound. Write an expression for p pounds of strawberries.
1 pound is $1.95; 2 pounds is 2×$1.95; 3 pounds is 2×$1.95
So p pounds is p×$1.95 = $1.95p
5. Kenneth has g gumballs. Maggie has 29 fewer gumballs than Kenneth. Choose the expression that shows how many gumballs Maggie has.
fewer means less than Kenneth; means we need tu subtract
g - 29
6)
5 + 36 ÷ 2 × 3 - 4 = 5 + 18 × 3 - 4 = 5 + 54 - 4 = 55
7)
18 + (6 – 2) × 2 = 18 + 4×2 = 18 + 8 = 26
8. Expand
-3( 2r + 5s). = -3×2r + (-3)×5s = -6r - 15s
9. Expand and simplify
5(2 - 3y) = 5×2 + 5×(-3y) = 10 - 15y
10.Factor:
7x + 49y = 7×x + 7×7y = 7(x + 7y)
11. Factor
6p − 36 = 6×p − 6×6 = 6(p − 6)
12. Which expression contains exactly 3 terms?
B. 8 + 2y - 5x
13. What is the coefficient of x? 8 + 5x - y
8 + 5x - y
C. 5
14. Identify the "like terms" in the expression: 2x + 4y - 3x + y - x
2x and -3x and -x; 4y and y
15. Factor 5x − 25
5x − 25 = 5×x − 5×5 = 5(x − 5)